8 Hour Timer
A free 8 hour timer that opens preset to 8 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 8 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 8 hours?
480 minutes is exactly 8 hours — 28,800 seconds in total. That is roughly 33.3% of a 24-hour day. Half of 8 hours is 4 hours, and two rounds back to back add up to 16 hours.
Eight hours is the classic workday — and the classic night's sleep.
Things that take about 8 hours
- Time an 8-hour road-trip leg or long-haul study day with a proper break at the end.
- Limit a weekend gaming or streaming marathon to 8 hours.
- Cap an 8-hour work shift, freelance block or hackathon sprint with a hard stop.
- Remind yourself to move, drink water or take medication after 8 hours.
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 8 hours?
8 hours is 480 minutes, or 28,800 seconds (8 × 60 × 60).
Does a 8 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 8 hours it stays accurate to the second.
Can I pause the 8-hour timer halfway through?
Yes. Press Pause at any point and Start to continue; the remaining part of the 8 hours is kept to the second.