12 hours timer
12 hours countdown with alarm.
Timer
12:00:00
Quick presets
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This timer is set to 12 hours. That is 43,200 seconds, 720 minutes, 43,200,000 milliseconds. It is 50% of a day.
During 12 hours a resting heart beats about 50,400 times and a person walks roughly 57,600 metres at an easy pace.
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What is a 12 hours timer good for?
- intermittent fasting
- bread dough and fermentation
- medication reminders
How to use it
Press the space bar or the Start button. When it reaches zero your chosen sound plays; on the main timer page you can add and chain several timers for intervals. Sound and volume settings are saved in your browser.
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Frequently asked questions
12 hours equals 43,200 seconds.
Press Start: the time is already set. You can pause it, reset it, change the sound or go full screen.
Yes. The timer keeps running in the background and rings when it ends as long as the page stays open; the tab title shows the time left.
In supported browsers the "Keep the screen on" option uses the Wake Lock API to prevent it.