90 Minute Timer
90-minute timer for deep work sessions, movies, or extended study blocks. A 90-minute cycle matches your body's natural ultradian rhythm.
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Set a time and press Start
What Can You Do in 90 Minutes?
Deep work session matching your ultradian rhythm — 90 minutes is the natural focus cycle
Movie watching with a hard stop if you need to be somewhere
Extended study block for complex material
Long-distance running or cycling training
Slow-cooked recipes that need monitoring
Tips for Your 90 Minutes Session
Your brain naturally cycles between high and low alertness every ~90 minutes. Work with this rhythm, not against it.
Take a real break after a 90-minute block — walk around, get fresh air, eat something.
Frequently Asked Questions
Why is 90 minutes a good work session length?
Research suggests we cycle through periods of high and low alertness roughly every 90 minutes (ultradian rhythm). Working in 90-minute blocks aligns with this natural cycle, making focus easier.
How many seconds is 90 minutes?
90 minutes equals 5,400 seconds.
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