SmartClock

Free · one click · drift-proof

20 minute timer

Preloaded to 20 minutes. Press Start and go. The display shows when it will finish, and the chime is impossible to miss.

20:00

Press Space to start / pause

What people set 20 minute timers for

Twenty minutes is the usual ceiling for a nap that leaves you sharper rather than groggy. Past roughly this point sleep deepens, and waking out of deep sleep produces the heavy feeling that puts people off napping entirely.

Need a different length? The countdown timer takes any duration up to 12 hours, and the pomodoro timer handles work and break cycles for you.

Frequently asked questions

How do I start the 20 minute timer?
The timer loads preset to 20 minutes — press Start (or the Space bar) and it counts down immediately, showing the exact wall-clock time it will finish.
Will it still ring if I switch tabs?
Yes. The deadline is anchored to your system clock rather than counted in ticks, so browser throttling can't delay it. The remaining time also shows in the tab title.
Can I change the duration?
Yes — presets from 1 to 60 minutes are one click away, and the custom field takes anything up to 12 hours.