A 3 hour timer is handy for a long drive break reminder, a slow roast, or a big study day. 3 hour is 10,800 seconds, 180 minutes, about 7.2 Pomodoros. For long timers, keep your device plugged in so it does not go to sleep before the alarm.
Need a different length? Type any time in the box above, or use +1 min while it runs. Pick a louder sound like School bell if you are across the room.
Teaching? Our sister site has a classroom timer with a noise meter, student picker and seating charts.
Frequently asked questions
How do I set a timer for 3 hour?
Just press Start on this page. The timer is already set to 3 hour. Press the space bar to pause and resume.
How many seconds is 3 hour?
3 hour is 10,800 seconds.
Is TimerTab free?
Yes. Every clock, timer and alarm is free, with no account and no download. It works in any modern browser on desktop, phone or tablet.
Will it keep time if I switch tabs?
Yes. TimerTab counts from the real clock time instead of counting ticks, so it stays accurate when the tab is in the background and catches up instantly when you come back.
Does it work offline?
Yes. After your first visit the pages are cached on your device, so timers, the stopwatch and alarms keep working without an internet connection.