3 Hour Timer
Three hours is a long bake, a big study session or a slow-cooked meal. Press Start and it rings at zero, even if you switch tabs.
Space start/pause · R reset · F full screen
Alarm & notification settings
Sound needs one tap on the page first (a browser rule). Keep this tab open: closing it stops every timer’s alarm. Why timers stay accurate in background tabs.
What people time with 3 hours
- Slow-cooking or low-temperature roasting
- A three-hour exam or study marathon
- Charging reminders
- Long parking sessions
Other lengths
Need two at once, like 3 hours for the pasta and 3 min for the sauce? The timer board runs as many as you like.
3 hours in other units
| Seconds | 10,800 |
|---|---|
| Minutes | 180 |
| Hours | 3 |
| Share link | countdownpro.app/?t=3h |
Questions
How do I set a 3 hours timer?
Press Start on this page. The 3 hours countdown begins at once and rings when it reaches zero. You can also press the space bar to start and pause.
How many seconds are in 3 hours?
3 hours is 10,800 seconds (180 minutes).
Will it still ring if I switch to another tab?
Yes, while the tab stays open. The alarm is scheduled for an exact end time when you press Start, so a background tab does not delay it. Turn on notifications to get a system alert too.
Can I run this alongside other timers?
This page runs one big timer. For several at once, open the main countdown timer board, which runs any number of labelled timers side by side.