90 Minute Timer
Free shareable timer - copy the link and anyone can start counting down instantly.
Why a 90 minute timer?
Ninety minutes is the length of a sleep cycle. Adults move through light sleep, deep sleep and REM in cycles averaging roughly ninety minutes, which is why sleep advice is usually framed in cycles rather than hours - waking at the end of one feels dramatically better than waking in the middle of it.
The same rhythm appears to continue while awake. Ultradian cycles of roughly ninety minutes are the basis for the popular practice of working in ninety-minute blocks followed by a genuine break, and not coincidentally it is also the length of a football match and most feature films.
What people use a 90 minute timer for
- Sleep cycles. One full cycle. Timing sleep in ninety-minute multiples is the usual way to avoid waking mid-deep-sleep.
- Ultradian work blocks. A long focus block followed by a real break, matching the body's natural cycle length.
- Football matches. Two forty-five minute halves - the standard full-match duration before stoppage time.
- Feature-length sessions. Films, workshops, and seminars that run to the classic ninety-minute format.
- Long exams. Extended papers and mock exams that need uninterrupted timing.
Other preset timer lengths
Frequently Asked Questions
How long is a sleep cycle?
Roughly ninety minutes on average for adults, though it varies between people and lengthens across the night. Sleep advice is often given in cycles because waking at the end of one - rather than in the middle of deep sleep - is what determines how rested you feel.
Why do people work in 90-minute blocks?
It follows the same ultradian rhythm as sleep cycles. The practical claim is that focus rises and falls on roughly that period, so a long block followed by a genuine break works better than pushing straight through.
Can I share this link with my class?
Yes - just copy the link from the box above and paste it into your LMS, email, or messaging app. When students open it they get a 1h30m timer that's ready to start with one tap. No account or download needed.
Does the timer save my progress?
The timer runs entirely in your browser - progress is not saved between page loads. If you refresh or close the tab the timer resets to 1h30m. For a timer that auto-starts when someone opens the link, add ?autostart=1 to the URL or use the shareable timer generator.
Can I add a label to my timer?
Absolutely. Add a ?label= parameter to the URL - for example https://stopwatch.now/timer-link/1h30m?label=Math+Quiz. The label appears above the countdown. You can also use the timer link generator to build a labelled timer link without editing URLs by hand.
Can I make the timer auto-start when someone opens the link?
Yes. Add ?autostart=1 to the URL. For example: https://stopwatch.now/timer-link/1h30m?autostart=1. The timer will begin counting down the moment the page loads - no click required.