12 hour timer
Press Start and an alarm will ring in exactly 12 hours. Good for a long study session, a workout, or a class.
12 hours is 12 hours (12 hours), or 43,200 seconds. The timer keeps exact time in a background tab and shows the time left in the tab title. Press Space to pause, R to reset, F for full screen.
Other timers
Seconds
Minutes and hours
- 1 min
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- 1 hr
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- 2 hr
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- 10 hr
- 12 hr
Set a custom timer · Stopwatch · Pomodoro timer · Classroom timer