Forgetting to turn it off
You flipped Shake It On on Tuesday morning to keep a download going. It's Saturday. You forgot. Your Mac has been awake for four days for no reason.
Auto-disable is the safety net. Pick a duration; after that long of being on, Shake It On flips itself off. No "but did I leave it on?" surprises.
Set it up
- Open Settings (menu bar → Settings…).
- Scroll to the General section.
- Set Auto-disable after to a value: 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, or 24 hours.
From the moment Enabled flips on, the timer starts. Once the configured duration elapses, Enabled flips back to off automatically.
Picking a duration
- 8 hours — the standard "work day" answer. Pair with launch-at-login: Mac boots, Shake It On starts, runs for 8 hours, stops. Boot the next morning, runs again.
- 12 hours — generous workday. Useful if your schedule slides between morning and evening.
- 24 hours — overnight renders + a buffer. Pair with a Render Session and Allow display to sleep.
- 2 hours — meeting + post-meeting work session. Manually flip on, do your thing, it stops while you're at lunch.
- 1 hour — quick "stay awake during this presentation" mode.
Manual override beats it
Auto-disable triggers off the elapsed time since Enabled was last flipped on. If you turn Shake It On off manually before the timer fires, the timer resets — next time you flip it on, the full duration starts over.
Snooze and Stay-awake-for don't reset the timer; they're separate mechanisms inside the "enabled" window.
vs. Stay awake for…
Two opposite-direction timers:
- Stay awake for forces the Mac awake for a fixed duration, ignoring Only-Shake-If conditions. Use it as a one-shot: "the next 60 minutes, just stay on no matter what."
- Auto-disable turns Shake It On off after a fixed duration of being on. Use it as a recurring safety net: "never let me leave this running for more than N hours."
Related
Auto-disable feature deep-dive · Force-active timer · Launch at login