diff --git a/README.md b/README.md
index 4aea002..02f5904 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,8 @@ emptying.
   Nothing is sent anywhere. Export/import lets you back up or move your data.
 - **Time-based estimates.** LSOS can't see the game. Business production runs while LSOS is
   open and tracking ("play time"). LSOS opens paused: press Start once you have loaded into a
-  session, or turn on tracking on open in Settings. Real-world cooldowns such as the Lucky Wheel
+  session, or turn on tracking on open in Settings. Played a while without LSOS? Skip time
+  moves every play-time tracker forward by however long you enter. Real-world cooldowns such as the Lucky Wheel
   run on the wall clock even when LSOS is closed.
 - **Sourced game data.** Rates and values come from sources such as gta.wiki. Where none exists
   for your upgrades, LSOS uses a best estimate and labels those numbers "(est.)".
diff --git a/docs/decisions/008-clock-details.md b/docs/decisions/008-clock-details.md
index 61e2d54..21e427c 100644
--- a/docs/decisions/008-clock-details.md
+++ b/docs/decisions/008-clock-details.md
@@ -33,6 +33,11 @@ browser events, listeners), `src/components/ClockBar.svelte` (indicator, toggle,
 - **Leaving the page** (`pagehide`) counts up to that moment and stops measuring, so time away
   is not counted if the page returns from the back/forward cache. `visibilitychange` fires after
   `pagehide` and must not restart the clock.
+- **Skip time** (issue #70): the clock bar's "Skip time" button takes a duration the user played
+  without LSOS tracking (same formats as resync: `10`, `1h 30m`, `1:30`) and reports it through
+  `onPlayTime` like any counted stretch, so every play-time tracker catches up at once. Real-time
+  timers are left alone: real time already passed. There is no undo, because trackers only take
+  positive stretches; the button shows the exact amount (`Skip 1:30:00`) before it is pressed.
 
 ## Why
 
diff --git a/docs/decisions/README.md b/docs/decisions/README.md
index 1dcdd09..043b149 100644
--- a/docs/decisions/README.md
+++ b/docs/decisions/README.md
@@ -18,7 +18,7 @@ free number, add one line below. **Replacing one:** write a new decision, then m
 - [005](005-weekly-data.md) Weekly events come from a JSON file updated by PR, not a live API
 - [006](006-persisted-state.md) Persisted state is versioned, migrated on load, exportable as JSON
 - [007](007-state-store.md) State store: unreadable data blocks saving like a newer version; import overrides
-- [008](008-clock-details.md) Clock details: session play time, opens paused (setting), throttled ticks counted, long gaps asked about
+- [008](008-clock-details.md) Clock details: session play time, opens paused (setting), throttled ticks counted, long gaps asked about, Skip time for play without LSOS
 - [009](009-terminal-design.md) Terminal look: tokens in `app.css`, self-hosted Oswald (OFL), browser-style tabs, base components in `src/components/ui/`
 - [010](010-resync.md) Resync: `EditableValue` for every tracked value, `BusinessBars` with Sold/Raided/Full and supply deliveries, undo keeps progress since, five-segment bars you can drag (duration format amended by 022; presets and edit view amended by 029)
 - [011](011-owned-properties.md) Owned properties and upgrades: catalog in `src/data/properties.ts`, toggle/choice upgrades (count: 016), Settings panel and Businesses gear
diff --git a/src/components/ClockBar.svelte b/src/components/ClockBar.svelte
index 4311ae2..5e3abf1 100644
--- a/src/components/ClockBar.svelte
+++ b/src/components/ClockBar.svelte
@@ -1,6 +1,8 @@
 <script lang="ts">
   import { formatDuration } from '../lib/clock'
-  import { answerGaps, clocks, togglePause } from '../lib/clock.svelte'
+  import { tick } from 'svelte'
+  import { answerGaps, clocks, skipPlayTime, togglePause } from '../lib/clock.svelte'
+  import { parseValue } from '../lib/resync'
   import Button from './ui/Button.svelte'
   import Digits from './ui/Digits.svelte'
 
@@ -18,6 +20,40 @@
       hourCycle: 'h23',
     }),
   )
+
+  // Skip time (issue #70): play time spent without LSOS tracking, added to every tracker.
+  let skipping = $state(false)
+  let draft = $state('')
+  let invalid = $state(false)
+  let skipped = $state<string | null>(null)
+  let input = $state<HTMLInputElement>()
+  const preview = $derived(parseValue(draft, 'duration'))
+
+  async function startSkipping() {
+    draft = ''
+    invalid = false
+    skipped = null
+    skipping = true
+    await tick()
+    input?.focus()
+  }
+
+  function stopSkipping() {
+    skipping = false
+  }
+
+  function confirmSkip(event: SubmitEvent) {
+    event.preventDefault()
+    if (preview === null) {
+      invalid = true
+      return
+    }
+    if (preview > 0) {
+      skipPlayTime(preview)
+      skipped = formatDuration(preview)
+    }
+    stopSkipping()
+  }
 </script>
 
 <!-- The portal bar at the top of the window, like "Business Management Portal" in game. -->
@@ -32,9 +68,48 @@
     <Button variant={paused ? 'primary' : 'ghost'} aria-pressed={paused} onclick={togglePause}>
       {paused ? 'Start' : 'Pause'}
     </Button>
+    <Button
+      aria-expanded={skipping}
+      title="Played without LSOS tracking? Move every play-time tracker forward"
+      onclick={() => (skipping ? stopSkipping() : startSkipping())}
+    >
+      Skip time
+    </Button>
   </div>
 </section>
 
+{#if skipping}
+  <form class="skip" aria-label="Skip time" onsubmit={confirmSkip}>
+    <label for="skip-time">Played without LSOS tracking? How long:</label>
+    <input
+      id="skip-time"
+      bind:this={input}
+      bind:value={draft}
+      aria-invalid={invalid}
+      aria-describedby="skip-time-hint"
+      autocomplete="off"
+      placeholder="10m"
+      oninput={() => (invalid = false)}
+      onkeydown={(event) => {
+        if (event.key === 'Escape') stopSkipping()
+      }}
+    />
+    <Button variant="primary" type="submit">
+      {preview ? `Skip ${formatDuration(preview)}` : 'Skip'}
+    </Button>
+    <Button onclick={stopSkipping}>Cancel</Button>
+    <span id="skip-time-hint" class="skip-hint" class:invalid>
+      {invalid ? 'Not a duration. ' : ''}Minutes (10), 1h 30m or 1:30. Every play-time tracker moves
+      forward by that much; real-time timers already count time away.
+    </span>
+  </form>
+{:else if skipped}
+  <p class="hint" role="status">
+    Skipped {skipped} of play time.
+    <Button small onclick={() => (skipped = null)}>OK</Button>
+  </p>
+{/if}
+
 {#if paused}
   <p class="hint">
     Press Start once you have loaded into a GTA Online session, not during loading screens: that is
@@ -119,6 +194,43 @@
     padding: var(--space-2) var(--space-4);
   }
 
+  .skip {
+    align-items: center;
+    border-bottom: 1px solid var(--line);
+    display: flex;
+    flex-wrap: wrap;
+    font-size: var(--text-sm);
+    gap: var(--space-2) var(--space-3);
+    padding: var(--space-2) var(--space-4);
+  }
+
+  .skip input {
+    background: var(--surface);
+    border: 1px solid var(--line);
+    border-radius: var(--radius);
+    color: var(--fg);
+    font-family: var(--font-display);
+    font-size: var(--text-md);
+    letter-spacing: var(--tracking);
+    min-height: 2.25rem;
+    min-width: 0;
+    padding: 0 var(--space-2);
+    width: 8rem;
+  }
+
+  .skip input[aria-invalid='true'] {
+    border-color: var(--danger);
+  }
+
+  .skip-hint {
+    color: var(--muted);
+    flex-basis: 100%;
+  }
+
+  .skip-hint.invalid {
+    color: var(--danger);
+  }
+
   .gap {
     align-items: center;
     border-bottom: 1px solid var(--warn);
diff --git a/src/lib/clock.svelte.ts b/src/lib/clock.svelte.ts
index 52eee88..f61929c 100644
--- a/src/lib/clock.svelte.ts
+++ b/src/lib/clock.svelte.ts
@@ -7,6 +7,7 @@ import {
   dismissGaps,
   pause,
   resume,
+  skipAhead,
   startSession,
   tick,
   type ClockState,
@@ -71,6 +72,12 @@ export function answerGaps(playing: boolean): void {
   else dismissGaps(clocks.play)
 }
 
+/** Counts `ms` of play time the user spent without LSOS tracking, so every tracker catches up. */
+export function skipPlayTime(ms: number): void {
+  report(skipAhead(clocks.play, ms))
+  saveNow()
+}
+
 setInterval(onTick, TICK_INTERVAL_MS)
 // A hidden tab may not have ticked for up to a minute. Count that time whenever the page is
 // hidden, frozen (Chrome Energy Saver) or shown again, and save trackers' progress before the
diff --git a/src/lib/clock.test.ts b/src/lib/clock.test.ts
index 2cb7ac5..d021f79 100644
--- a/src/lib/clock.test.ts
+++ b/src/lib/clock.test.ts
@@ -8,6 +8,7 @@ import {
   pause,
   realElapsed,
   resume,
+  skipAhead,
   startSession,
   tick,
   type ClockState,
@@ -104,6 +105,27 @@ describe('confirming long gaps', () => {
   })
 })
 
+describe('skipping ahead', () => {
+  it('counts time played without LSOS and reports it, paused or not', () => {
+    const t = setup()
+    t.tickAfter(MINUTE)
+    expect(skipAhead(t.clock, 10 * MINUTE)).toBe(10 * MINUTE)
+    expect(t.clock.playMs).toBe(11 * MINUTE)
+    pause(t.clock, t.now())
+    expect(skipAhead(t.clock, 5 * MINUTE)).toBe(5 * MINUTE)
+    expect(t.clock).toMatchObject({ playMs: 16 * MINUTE, paused: true })
+  })
+
+  it('does not move the next tick or count negative time', () => {
+    const t = setup()
+    skipAhead(t.clock, 10 * MINUTE)
+    t.tickAfter(SECOND)
+    expect(t.reported()).toBe(SECOND)
+    expect(skipAhead(t.clock, -MINUTE)).toBe(0)
+    expect(t.clock.playMs).toBe(10 * MINUTE + SECOND)
+  })
+})
+
 describe('pause and resume', () => {
   it('does not count paused time, and counts up to the pause', () => {
     const t = setup()
diff --git a/src/lib/clock.ts b/src/lib/clock.ts
index 5ec57a7..86ffa1c 100644
--- a/src/lib/clock.ts
+++ b/src/lib/clock.ts
@@ -99,6 +99,16 @@ export function dismissGaps(clock: ClockState): void {
   clock.unconfirmedMs = 0
 }
 
+/**
+ * The user played without LSOS tracking (issue #70): count `ms` as play time, as if LSOS had
+ * been running. Returns the play time counted, for trackers to add to their progress.
+ */
+export function skipAhead(clock: ClockState, ms: number): number {
+  const counted = Math.max(0, ms)
+  clock.playMs += counted
+  return counted
+}
+
 /** Real time since `sinceMs` (epoch ms). Never negative, even if the clock was set back. */
 export function realElapsed(sinceMs: number, now: number): number {
   return Math.max(0, now - sinceMs)