24 Hour Timer
A 24 hour timer that is ready to go. Press Start, or the space bar, and it counts down 24 hours and then sounds the alarm.
24 hours
Spacestart / pauseRresetFfull screen+ −add or remove a minute0–9type a time
Good for 24 hours
- Twenty-four hours is one full day: this timer ends at the same clock time tomorrow.
- Useful for “take once a day” reminders, a 24-hour challenge or a cooling-off period.
- For a timer this long, keep the tab open and the device awake. The end time is saved on this device, so if you do close the page you can reopen it and see what is left.
Other timers
Questions people ask
Will the 24 hours timer still go off if I switch tabs?
Yes. The end time is fixed when you press Start, so the countdown stays correct in a background tab and the alarm sounds on time as long as the tab stays open. If you turn on “Notify me”, you also get a notification.
What happens if I close the page or my computer sleeps?
The end time is saved on this device. Reopen the page and the timer shows the correct time left, or tells you how long ago it finished. A closed tab or a sleeping device cannot play the alarm.
Can I change it from 24 hours?
Yes. Use the + and − steppers or type a new time, press + or − on a keyboard to add or remove a minute, or open the main timer to save your own presets.