3 Hour Timer
A free 3 hour timer that opens preset to 3 hours. Press Start and it counts down in your browser, sounding an alarm at zero. Great for long focus blocks, slow cooking, study sessions and naps. No download, no signup.
What is this timer good for?
- A long focus or writing block with scheduled breaks
- Slow cooking, braising or smoking food
- Tracking a parking meter or appointment window
- A movie-length rest, nap or quiet period
- Capping screen time or a gaming session for kids
How to use it
- The timer opens preset to 3 hours.
- Adjust the hours, minutes or seconds for a different length.
- Press Start and the big display counts down.
- An alarm sounds at 00:00:00 — press Reset to run it again.
How long is 3 hours?
180 minutes is exactly 3 hours — 10,800 seconds in total. That is roughly 12.5% of a 24-hour day. Half of 3 hours is 1 hour 30 minutes, and two rounds back to back add up to 6 hours.
Three hours is roughly a marathon finish time for a strong amateur runner.
Things that take about 3 hours
- Cap a long study session at 3 hours and schedule real rest afterwards.
- Set 3 hours to cover a feature film with trailers — or a two-episode binge.
- Break a 3-hour work marathon into hourly checkpoints and stand up at each alarm.
- Charge, soak, dehydrate or cure anything that needs 3 hours of set-and-forget waiting.
FAQ
Will it ring if I switch tabs?
Yes. The timer calibrates against your system clock, so it stays accurate even in a background tab. Just don't close the tab.
Do I need to download anything?
No. The timer runs entirely in your browser with no download, signup or plugin.
Can I change the duration?
Yes. Type any hours, minutes and seconds into the fields, or pick a related timer above.
Is it free?
Yes, it is completely free to use.
How many minutes are in 3 hours?
3 hours is 180 minutes, or 10,800 seconds (3 × 60 × 60).
Does a 3 hour countdown stay accurate for that long?
Yes. The countdown is anchored to your device's clock rather than counting ticks, so even across the full 3 hours it stays accurate to the second.
What if I need a bit more or less than 3 hours?
Adjust the hours, minutes and seconds fields before pressing Start — the 3-hour preset is only a starting point, and the Related links above jump to neighbouring lengths.