90 Minute Timer
An hour and a half. About the length of one sleep cycle, one football match and plenty of films.
No signup. Works in any browser. A clear sound when time is up.
Sleep cycles
Sleep runs in cycles of light, deep and REM sleep. Each one averages about 90 minutes, though it varies from roughly 70 to 120 minutes between people and through the night. Waking at the end of a cycle tends to feel easier than waking from deep sleep, which is why some people nap for a full 90 minutes rather than 45.
Deep work
Many writers and programmers keep a 90 minute block for their hardest task of the day: long enough to get properly into it, with a natural stopping point at the end. Pick one task, close everything else, and stop when it sounds.
Matches, films and exams
A football match is 90 minutes plus stoppage time. A lot of films and exam papers run about 90 minutes too, so this timer is handy for sitting a past paper under real conditions.
How the timer works
- Press Start and it counts down. Change the hours, minutes or seconds first if you need a different length.
- It works from your device clock, so it stays right in a background tab, and the time left shows in the tab title.
- Pick an end sound (chime, bell, beep, gentle or silent). The full screen button puts the timer alone on the screen.
- Keeps working offline once the page has loaded. No account, nothing to install.
Frequently asked questions
How long is one sleep cycle?
About 90 minutes on average, but anywhere from roughly 70 to 120 minutes. Cycles also change through the night.
Can I use this as a nap timer?
Yes, for a full-cycle nap. Keep the screen on, because phones can pause web pages when they lock.
How long is a football match?
90 minutes of play in two 45 minute halves, plus stoppage time.
Does it work offline?
Yes, once the page has loaded.
Further reading
Other timers
Need to count up instead? Use the online stopwatch.