diff --git a/frontend/dashboard.css b/frontend/dashboard.css
index 5ede2b1..fe1c74f 100644
--- a/frontend/dashboard.css
+++ b/frontend/dashboard.css
@@ -138,6 +138,12 @@ textarea { resize: vertical; min-height: 120px; }
 .plan-preview-actions button { min-height:44px; }
 .plan-today-actions { position:sticky; bottom:0; display:grid; grid-template-columns:1fr 1fr; gap:8px; margin:16px -6px -6px; padding:12px 6px; padding-bottom:calc(12px + env(safe-area-inset-bottom)); background:rgba(11,21,38,.98); border-top:1px solid #2a496e; }
 .plan-today-actions button { min-height:44px; width:100%; }
+.today-interruption-sheet { position:fixed; inset:0; z-index:92; display:flex; align-items:flex-end; justify-content:center; background:rgba(5,12,21,.82); backdrop-filter:blur(4px); }
+.today-interruption-sheet[hidden] { display:none; }
+.today-interruption-panel { box-sizing:border-box; width:min(620px,100%); max-height:100dvh; overflow:auto; overflow-x:hidden; padding:18px; padding-bottom:calc(18px + env(safe-area-inset-bottom)); border:1px solid #b45309; border-radius:18px 18px 0 0; background:#0b1526; }
+.today-interruption-panel h2 { margin:.25rem 0; overflow-wrap:anywhere; }
+.today-interruption-actions { display:grid; grid-template-columns:1fr 1fr; gap:8px; margin-top:16px; }
+.today-interruption-actions button { min-height:44px; width:100%; }
 .today-recap-sheet { position:fixed; inset:0; z-index:88; display:flex; align-items:flex-end; justify-content:center; background:rgba(5,12,21,.82); backdrop-filter:blur(4px); }
 .today-recap-sheet[hidden] { display:none; }
 .today-recap-panel { box-sizing:border-box; width:min(620px,100%); max-height:100%; overflow:auto; overflow-x:hidden; padding:18px; padding-bottom:calc(18px + env(safe-area-inset-bottom)); border:1px solid #2a496e; border-radius:18px 18px 0 0; background:#0b1526; }
@@ -158,6 +164,7 @@ textarea { resize: vertical; min-height: 120px; }
 .today-recap-actions { position:sticky; bottom:0; display:grid; grid-template-columns:1fr 1fr; gap:8px; margin:16px -6px -6px; padding:12px 6px; padding-bottom:calc(12px + env(safe-area-inset-bottom)); background:rgba(11,21,38,.98); border-top:1px solid #2a496e; }
 .today-recap-actions button { min-height:44px; width:100%; }
 @media (max-width:420px) {
+  .today-interruption-actions { grid-template-columns:1fr; }
   .today-recap-actions { grid-template-columns:1fr; }
   .today-recap-row { grid-template-columns:1fr; }
   .today-recap-row input { width:min(100%,8rem); }
diff --git a/frontend/dashboard.js b/frontend/dashboard.js
index e27ea34..35072dd 100644
--- a/frontend/dashboard.js
+++ b/frontend/dashboard.js
@@ -219,6 +219,8 @@
   });
   laterSync.startLifecycle({ window, document });
   document.addEventListener('visibilitychange', () => {
+    if (document.hidden) interruptionPrompt.background();
+    else interruptionPrompt.foreground();
     if (!document.hidden) refreshMyWorkView();
   });
 
@@ -935,6 +937,23 @@
     queryAll: s => document.querySelectorAll(s),
     formatEstimate: formatPlanMinutes,
   });
+  const interruptionPrompt = createTodayInterruptionPrompt({
+    timer,
+    sheet: qs('#today-interruption-sheet'),
+    description: qs('#today-interruption-description'),
+    getItemLabel: identity => {
+      const item = [...todayMyWork, ...activeMyWork].find(entry => todayWork.identity(entry) === identity);
+      return item?.title || '';
+    },
+    onResolved: () => timerView.render(),
+  });
+  window.addEventListener('pagehide', () => interruptionPrompt.background());
+  interruptionPrompt.restore();
+  document.querySelectorAll('[data-today-interruption]').forEach(button => {
+    button.addEventListener('click', () =>
+      interruptionPrompt.resolve(button.dataset.todayInterruption)
+    );
+  });
   const todayRecapView = setupTodayRecap(
     timer, timerView, todayWork, api, qs, escapeHtml, closeOpenWorkSheets, updateWorkSessionActions,
     () => planningOwnerLogin,
@@ -3481,6 +3500,7 @@
       if (activeFlushLogin) {
         confirmedOwnerLogin = activeFlushLogin;
         updateDeliveryReceiptControls();
+        interruptionPrompt.restore();
       }
       snapshot.context.notifications = lastNotifications;
       renderContextSnapshot(snapshot.context);
@@ -5097,6 +5117,7 @@
     const outage = mode === 'outage';
     confirmedOwnerLogin = String(saved.user?.login || '').trim();
     planningOwnerLogin = confirmedOwnerLogin;
+    interruptionPrompt.restore();
     updatePlanningAvailability();
     saved.notifications = notificationReadOutbox.suppress(saved.notifications || []);
     lastNotifications = saved.notifications;
diff --git a/frontend/index.html b/frontend/index.html
index 1373aca..1d8b1e7 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -267,6 +267,19 @@
   </section>
 </div>
 
+<div class="today-interruption-sheet" id="today-interruption-sheet" role="dialog" aria-modal="true" aria-labelledby="today-interruption-title" hidden>
+  <section class="today-interruption-panel">
+    <div class="small">Today timer</div>
+    <h2 id="today-interruption-title">Were you working while away?</h2>
+    <p id="today-interruption-description" class="small"></p>
+    <p class="small muted">Choose once before the timer continues. You can include the full interval or remove it from your recap.</p>
+    <div class="today-interruption-actions">
+      <button type="button" data-today-interruption="count">Count this time</button>
+      <button type="button" data-today-interruption="exclude">Exclude this time</button>
+    </div>
+  </section>
+</div>
+
 <div class="today-recap-sheet" id="today-recap-sheet" role="dialog" aria-modal="true" aria-labelledby="today-recap-title" hidden>
   <section class="today-recap-panel">
     <div class="today-recap-header">
diff --git a/frontend/today-timer.js b/frontend/today-timer.js
index 9532eff..7384714 100644
--- a/frontend/today-timer.js
+++ b/frontend/today-timer.js
@@ -3,7 +3,7 @@ function createTodayTimer({ storage, getLogin, now = () => Date.now() }) {
     const login = String(getLogin?.() || '').trim().toLowerCase();
     return login ? 'stackchain.today-timer.v1.' + encodeURIComponent(login) : '';
   };
-  const empty = () => ({ version:1, active_identity:'', entries:{} });
+  const empty = () => ({ version:1, active_identity:'', entries:{}, away_at:null, pending_interruption:null });
   const read = () => {
     const ownerKey = key();
     if (!ownerKey || !storage) return empty();
@@ -26,6 +26,12 @@ function createTodayTimer({ storage, getLogin, now = () => Date.now() }) {
       return false;
     }
   };
+  const validPending = state => {
+    const pending = state.pending_interruption;
+    return pending && typeof pending.identity === 'string' && pending.identity &&
+      Number.isFinite(pending.away_ms) && pending.away_ms >= 0 ?
+      { identity:pending.identity, away_ms:pending.away_ms } : null;
+  };
   const settle = (state, at = now()) => {
     const entry = state.entries[state.active_identity];
     if (!entry?.running) return state;
@@ -55,11 +61,14 @@ function createTodayTimer({ storage, getLogin, now = () => Date.now() }) {
       entry.started_at = now();
       entry.running = true;
       state.entries[identity] = entry;
+      state.away_at = null;
+      state.pending_interruption = null;
       return write(state);
     },
     pause() {
       const state = read();
       settle(state);
+      state.away_at = null;
       return write(state);
     },
     resume() {
@@ -75,6 +84,55 @@ function createTodayTimer({ storage, getLogin, now = () => Date.now() }) {
     stop() {
       const state = read();
       settle(state);
+      state.away_at = null;
+      state.pending_interruption = null;
+      return write(state);
+    },
+    markAway() {
+      const state = read();
+      const entry = state.entries[state.active_identity];
+      if (!entry?.running || validPending(state)) return false;
+      if (Number.isFinite(state.away_at) && state.away_at >= 0) return true;
+      state.away_at = now();
+      return write(state);
+    },
+    reconcileInterruption(thresholdMs = 5 * 60 * 1000) {
+      const state = read();
+      const existing = validPending(state);
+      if (existing) return existing;
+      state.pending_interruption = null;
+      const entry = state.entries[state.active_identity];
+      const awayAt = Number(state.away_at);
+      const detectedAt = now();
+      state.away_at = null;
+      if (!entry?.running || !Number.isFinite(awayAt) || awayAt < 0 || detectedAt < awayAt ||
+          detectedAt - awayAt < thresholdMs) {
+        write(state);
+        return null;
+      }
+      const awayMs = detectedAt - awayAt;
+      settle(state, detectedAt);
+      state.pending_interruption = { identity:state.active_identity, away_ms:awayMs };
+      write(state);
+      return { ...state.pending_interruption };
+    },
+    pendingInterruption() {
+      return validPending(read());
+    },
+    resolveInterruption(decision) {
+      if (decision !== 'count' && decision !== 'exclude') return false;
+      const state = read();
+      const pending = state.pending_interruption;
+      const entry = pending && state.entries[pending.identity];
+      if (!entry || !Number.isFinite(pending.away_ms) || pending.away_ms < 0) return false;
+      if (decision === 'exclude') {
+        entry.elapsed_ms = Math.max(0, Number(entry.elapsed_ms) - pending.away_ms);
+      }
+      state.active_identity = pending.identity;
+      entry.started_at = now();
+      entry.running = true;
+      state.pending_interruption = null;
+      state.away_at = null;
       return write(state);
     },
     recapEntries() {
@@ -128,7 +186,33 @@ function createTodayTimerView({ timer, isActive, queryAll, formatEstimate }) {
   };
 }
 
+function createTodayInterruptionPrompt({ timer, sheet, description, getItemLabel, onResolved }) {
+  const render = pending => {
+    if (!pending) {
+      sheet.hidden = true;
+      return false;
+    }
+    const label = String(getItemLabel?.(pending.identity) || 'Current Today item');
+    const minutes = Math.max(1, Math.round(pending.away_ms / 60000));
+    description.textContent = label + ' · away for ' + minutes + ' minute' + (minutes === 1 ? '' : 's');
+    sheet.hidden = false;
+    return true;
+  };
+  return {
+    background() { return timer.markAway(); },
+    foreground() { return render(timer.reconcileInterruption()); },
+    restore() { return render(timer.pendingInterruption()); },
+    resolve(decision) {
+      if (!timer.resolveInterruption(decision)) return false;
+      sheet.hidden = true;
+      onResolved?.();
+      return true;
+    },
+  };
+}
+
 if (typeof module !== 'undefined' && module.exports) {
   createTodayTimer.createView = createTodayTimerView;
+  createTodayTimer.createInterruptionPrompt = createTodayInterruptionPrompt;
   module.exports = createTodayTimer;
 }
diff --git a/tests/test_my_work.py b/tests/test_my_work.py
index 0817294..119e797 100644
--- a/tests/test_my_work.py
+++ b/tests/test_my_work.py
@@ -1976,6 +1976,159 @@ process.stdout.write(JSON.stringify({{
     }
 
 
+def test_today_timer_reconciles_long_away_time_once_and_keeps_short_switches_seamless():
+    script = f"""
+const createTodayTimer = require({json.dumps(str(TODAY_TIMER))});
+const values = new Map();
+const storage = {{
+  getItem:key => values.has(key) ? values.get(key) : null,
+  setItem:(key,value) => values.set(key,value),
+  removeItem:key => values.delete(key),
+}};
+let login = 'timmy';
+let now = 0;
+const timer = createTodayTimer({{storage,getLogin:() => login,now:() => now}});
+timer.activate('issue:repo:591:');
+now = 60000;
+timer.markAway();
+now = 4 * 60000;
+const short = timer.reconcileInterruption();
+now = 5 * 60000;
+timer.markAway();
+now = 11 * 60000;
+const pending = timer.reconcileInterruption();
+now = 12 * 60000;
+const frozen = timer.snapshot();
+const restored = createTodayTimer({{storage,getLogin:() => login,now:() => now}}).pendingInterruption();
+const counted = timer.resolveInterruption('count');
+const afterCount = timer.snapshot();
+const duplicate = timer.resolveInterruption('count');
+now = 13 * 60000;
+timer.markAway();
+now = 19 * 60000;
+timer.reconcileInterruption();
+const excluded = timer.resolveInterruption('exclude');
+const afterExclude = timer.snapshot();
+login = 'alexander';
+const isolated = timer.pendingInterruption();
+process.stdout.write(JSON.stringify({{
+  short,pending,frozen,restored,counted,afterCount,duplicate,excluded,afterExclude,isolated,
+}}));
+"""
+    result = subprocess.run(["node", "-e", script], capture_output=True, text=True)
+
+    assert result.returncode == 0, result.stderr
+    assert json.loads(result.stdout) == {
+        "short": None,
+        "pending": {
+            "identity": "issue:repo:591:",
+            "away_ms": 360000,
+        },
+        "frozen": {
+            "identity": "issue:repo:591:",
+            "elapsed_ms": 660000,
+            "running": False,
+        },
+        "restored": {
+            "identity": "issue:repo:591:",
+            "away_ms": 360000,
+        },
+        "counted": True,
+        "afterCount": {
+            "identity": "issue:repo:591:",
+            "elapsed_ms": 660000,
+            "running": True,
+        },
+        "duplicate": False,
+        "excluded": True,
+        "afterExclude": {
+            "identity": "issue:repo:591:",
+            "elapsed_ms": 720000,
+            "running": True,
+        },
+        "isolated": None,
+    }
+
+
+def test_today_interruption_prompt_restores_and_resolves_the_pending_mobile_decision():
+    script = f"""
+const createTodayTimer = require({json.dumps(str(TODAY_TIMER))});
+const values = new Map();
+const storage = {{getItem:k=>values.get(k)||null,setItem:(k,v)=>values.set(k,v)}};
+let now = 0;
+const timer = createTodayTimer({{storage,getLogin:()=>'timmy',now:()=>now}});
+const sheet = {{hidden:true}};
+const description = {{textContent:''}};
+let resolved = 0;
+const prompt = createTodayTimer.createInterruptionPrompt({{
+  timer, sheet, description,
+  getItemLabel: identity => identity === 'issue:r:7:' ? 'Fix mobile timer' : '',
+  onResolved: () => resolved++,
+}});
+timer.activate('issue:r:7:');
+now = 60000;
+prompt.background();
+now = 7 * 60000;
+const opened = prompt.foreground();
+const shown = {{hidden:sheet.hidden, text:description.textContent}};
+const restored = prompt.restore();
+const excluded = prompt.resolve('exclude');
+const closed = sheet.hidden;
+process.stdout.write(JSON.stringify({{opened,shown,restored,excluded,closed,resolved}}));
+"""
+    result = subprocess.run(["node", "-e", script], capture_output=True, text=True)
+
+    assert result.returncode == 0, result.stderr
+    assert json.loads(result.stdout) == {
+        "opened": True,
+        "shown": {
+            "hidden": False,
+            "text": "Fix mobile timer · away for 6 minutes",
+        },
+        "restored": True,
+        "excluded": True,
+        "closed": True,
+        "resolved": 1,
+    }
+
+
+def test_today_interruption_detection_is_idempotent_and_fails_closed_for_invalid_state():
+    script = f"""
+const createTodayTimer = require({json.dumps(str(TODAY_TIMER))});
+const values = new Map();
+const storage = {{getItem:k=>values.get(k)||null,setItem:(k,v)=>values.set(k,v)}};
+let now = 0;
+const timer = createTodayTimer({{storage,getLogin:()=>'timmy',now:()=>now}});
+timer.activate('issue:r:1:');
+now = 60000;
+timer.markAway();
+now = 120000;
+timer.markAway();
+now = 6 * 60000;
+const originalCheckpoint = timer.reconcileInterruption();
+timer.resolveInterruption('exclude');
+timer.pause();
+now = 20 * 60000;
+const paused = timer.markAway();
+const key = 'stackchain.today-timer.v1.timmy';
+const invalid = JSON.parse(values.get(key));
+invalid.pending_interruption = {{identity:7,away_ms:'bad'}};
+invalid.away_at = now + 1000;
+values.set(key, JSON.stringify(invalid));
+const malformed = timer.reconcileInterruption();
+process.stdout.write(JSON.stringify({{originalCheckpoint,paused,malformed,pending:timer.pendingInterruption()}}));
+"""
+    result = subprocess.run(["node", "-e", script], capture_output=True, text=True)
+
+    assert result.returncode == 0, result.stderr
+    assert json.loads(result.stdout) == {
+        "originalCheckpoint": {"identity": "issue:r:1:", "away_ms": 300000},
+        "paused": False,
+        "malformed": None,
+        "pending": None,
+    }
+
+
 def test_today_timer_switches_items_retains_elapsed_time_and_is_account_bound():
     script = f"""
 const createTodayTimer = require({json.dumps(str(TODAY_TIMER))});
@@ -2057,6 +2210,25 @@ async def test_today_timer_is_wired_into_every_mobile_session_control():
     assert '.work-session-nav [data-work-session-timer-toggle] { min-height:44px;' in html
 
 
+@pytest.mark.anyio
+async def test_dashboard_reconciles_long_today_interruptions_in_a_touch_safe_sheet():
+    html = await dashboard()
+
+    assert 'id="today-interruption-sheet"' in html
+    assert 'id="today-interruption-description"' in html
+    assert 'data-today-interruption="count"' in html
+    assert 'data-today-interruption="exclude"' in html
+    assert "const interruptionPrompt = createTodayInterruptionPrompt({" in html
+    assert "if (document.hidden) interruptionPrompt.background();" in html
+    assert "else interruptionPrompt.foreground();" in html
+    assert "window.addEventListener('pagehide', () => interruptionPrompt.background());" in html
+    assert "interruptionPrompt.restore();" in html
+    assert "interruptionPrompt.resolve(button.dataset.todayInterruption)" in html
+    assert ".today-interruption-panel { box-sizing:border-box; width:min(620px,100%);" in html
+    assert "padding-bottom:calc(18px + env(safe-area-inset-bottom))" in html
+    assert ".today-interruption-actions button { min-height:44px; width:100%; }" in html
+
+
 def test_active_today_session_reopens_current_item_without_restarting_checkpoint():
     script = f"""
 const buildMyWork = require({json.dumps(str(MY_WORK))});