10 Hour Timer (10h)
Free online 10 hour (10h) countdown timer with alarm
Set a 10 hour timer for sleep, long shifts, slow cooking, or all-day countdowns. The 10h countdown keeps running in your browser and alerts you when time is up.
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Customise colour, duration and size →Use in Google Docs or Canva →About the 10 Hour Timer
A 10 hour countdown for overnight and full-shift timing. It recovers exactly after device sleep, shows the finish time and date, plays optional rain or brown noise, and alarms at zero.
TimerHub calculates remaining time from an absolute finish timestamp, so missed browser callbacks do not create drift. Read the timing accuracy methodology and reproducible tests.
Common Uses
- Sleep timer
- Overnight countdown
- Slow roast or braise
- Work shift timer
- Fasting window check
How to Use the 10 Hour Timer
- Press Start — or the Space bar — to run the 10 hour countdown. Space also pauses and resumes it; R resets it
- Adjust by 5 minutes with the +/- buttons while it runs, toggle Repeat to loop it, and check the finish time shown under the display
- Use the Fullscreen control below the timer for a room-sized countdown (Esc to exit)
- Choose or mute the alarm in the header's sound settings, and pick a background sound — rain, ocean, fireplace or brown noise — that fades out at zero
- Enable notifications to be alerted when your 10 hour timer finishes in a background tab, and add
?autostart=1to the link to start the countdown on load
Frequently Asked Questions
How long is 10 hours in minutes?
10 hours is exactly 600 minutes or 36,000 seconds. Our free 10-hour countdown timer tracks every second and sounds an alarm when done.
What is a 10 hour timer used for?
A 10 hour timer is commonly used for sleep timer, overnight countdown, slow roast or braise. Set the countdown and focus on your task with confidence.
Does the timer work in the background?
Yes, our timer continues running even if you switch to another tab or minimize your browser. Enable push notifications to get alerted when your countdown finishes.
Will the alarm sound after 10 hours?
Yes, an alarm sound plays automatically when the 10-hour countdown reaches zero. You can also enable push notifications for an extra alert, even if you’re in another tab.
Can I make the timer fullscreen?
Yes, use the Fullscreen control below the timer for a distraction-free full-screen countdown — useful for long study sessions, offices, and shared screens. Press Esc to exit fullscreen.