3 Hour Timer

  • Set Sound
  • Set Time
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How to run a 3 hour timer

This 3 hour timer counts down from 3:00:00 (180 minutes) and plays an alarm when it reaches zero. Once started, it shows the clock time it will finish, so you can plan the rest of your day.

  1. Press Start.
  2. Note the end time shown on screen.
  3. Keep the tab open. You can switch to other tabs; the time left appears in the tab title.

Long sessions this fits

Full practice exams. Some standardized tests and final exams run close to three hours. Practicing under a single long countdown builds stamina. The exam timer has a 180 minute preset with warnings at 30, 10 and 5 minutes left and shows start and finish times.

"Study with me" sessions. A 3 hour study block works best when broken up. Six Pomodoros of 25 minutes plus a 5 minute break each add up to exactly 180 minutes. Run them on the Pomodoro timer and use this page as the overall deadline.

Everyday reminders. Move the car before a parking limit runs out, check on a long cooking project, or end a gaming or screen-time session.

Things to know for long timers

  • The countdown is measured against your system clock, so it stays accurate for hours.
  • The alarm only sounds while the page is open. Don't close the tab or let your laptop sleep.
  • On phones, keeping the screen awake depends on the browser. Plugging in your phone helps on long runs.

FAQ

Can I set 2 hours 45 minutes instead?

Yes. Use Set Time, or the countdown timer for any hours, minutes and seconds.

Is this the same as a 180 minute timer?

Yes. Three hours equals 180 minutes or 10,800 seconds.