90 Minute Timer

Free online 90 minute timer. Perfect for ultradian rhythm work cycles, movies, and sports halves.

Ultradian work cycleFootball halfDeep workMovie timing
⏰ Time's Up!
01:30:00
OTHER TIMERS
2 Min 3 Min 45 Min 90 Min Chess Interval Lap Timer 3 Hour Silent Fullscreen
FAQ
What is a 90-minute cycle?
The ultradian rhythm is a natural 90-minute focus cycle your brain follows — working with it boosts productivity.
How long is 90 minutes in hours?
90 minutes equals 1 hour and 30 minutes.