3-Hour Timer
Press start. It counts down to zero and rings an alarm — nothing to download, nothing to sign up for.
About this 3-hour timer
A one-click 3-hour countdown, most often used for mock exams, slow roasting and braising, or a long work session. It runs in your browser and rings when it reaches zero.
Three hours
Three hours is a standard final-exam length, the duration of a feature-length film with ads, and a common slow-roast or braise time. For focus work it's too long without breaks, so treat it as a session with built-in rests rather than one continuous block.
3 hours in other units
| Seconds | 10,800 |
|---|---|
| Minutes | 180 |
| Hours | 3 |
| Milliseconds | 10,800,000 |
| Share of a day | 12.5% |
Tips for using a 3-hour timer
- For a full mock exam, use a 3-hour timer and sit it in one go to build stamina.
- Braised short ribs and pulled pork shoulder often need 3 hours or more at low heat.
- If you're working, plan a 10-minute break roughly every 50-90 minutes inside the three hours.
Frequently asked questions
How do I set a 3-hour timer?
Press Start above and the page counts down from 3 hours on its own — nothing to type. Need a little longer? Press +1 min while it runs, or pick a nearby duration from the list.
How many seconds are in 3 hours?
3 hours is 10,800 seconds — 180 minutes or 3 hours. That's 12.5% of a day.
What is a 3-hour timer good for?
People commonly use a 3-hour timer for mock exams, slow roasting and braising, or a long work session.
Will it keep time if I switch tabs?
Yes. The countdown is measured against your device clock rather than counting screen refreshes, so it stays accurate in a background tab and the alarm fires on time. For a timer this long, keep the device awake — some phones pause browser audio when locked.