151 Minute Timer
This free 151 minute timer is ready to go — the countdown is already set to 2 hours 31 minutes. Press Start and watch it tick down; a built-in alarm sound plays at zero. No download, no signup; works on desktop and mobile.
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 2 hours 31 minutes.
- 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 2 hours 31 minutes?
151 minutes converts to 2 hours and 31 minutes (about 2.52 hours), or 9,060 seconds in total. That is roughly 10.5% of a 24-hour day. Half of 2 hours 31 minutes is 1 hour 15 minutes 30 seconds, and two rounds back to back add up to 5 hours 2 minutes.
Need a reference point? 2 hours 31 minutes is roughly one feature film, or two back-to-back TV episodes with credits.
Things that take about 2 hours 31 minutes
- Break a 151-minute work marathon into hourly checkpoints and stand up at each alarm.
- Charge, soak, dehydrate or cure anything that needs 2 hours 31 minutes of set-and-forget waiting.
- Set 2 hours 31 minutes for a slow-cooker, brisket or braise you must not forget about.
- Track a 151-minute parking window, airport layover or appointment slot.
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 seconds are in 151 minutes?
151 minutes equals exactly 9,060 seconds (151 × 60).
How long is 151 minutes in hours?
151 minutes is 2 hours and 31 minutes, or about 2.52 hours.
Can I restart the 151-minute countdown when it finishes?
Yes. When the alarm sounds, press Reset and then Start to run the full 2 hours 31 minutes again — handy for repeated rounds.