12 Hour Timer
Twelve hours is half a day, the short end of the usual steep time for cold brew coffee.
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Rings even in a background tab · Space bar = start/pause
What can you do in 12 hours?
- Steeping cold brew coffee
- Twelve-hour shift tracking
- Overnight fridge-proofed dough
- Smoking a large pork shoulder
Tip: Cold brew can steep 12 to 24 hours; start tasting at 12 and strain once it reaches the strength you like.
12 hours in other units
720 minutes
43,200 seconds
43,200,000 milliseconds
1200% of an hour
fits 2 times into a day
Need a different length? Use the custom countdown timer, or set a clock-time alarm instead.
All timers
Seconds
Minutes
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Hours
12-hour timer FAQ
How do I set a timer for 12 hours?
Press Start on this page. The 12-hour countdown begins immediately — no settings to change. Press the space bar to pause or resume.
Will the 12-hour timer ring if I switch tabs?
Yes. The countdown runs from a fixed end time, so it keeps going and rings in a background tab. The remaining time also shows in the tab title. Keep the tab open and the device unmuted.
Can I get a notification when it ends?
Yes — allow notifications when your browser asks after you press Start. You'll get a desktop or phone notification in addition to the beep.
Does it work offline?
Yes. After your first visit the page is cached, so the timer works without an internet connection.