90-Minute Focus Timer
A 90-minute deep work session based on the body's natural ultradian rhythm, followed by a 20-minute recovery break.
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About this timer
Research on ultradian rhythms suggests the brain operates in roughly 90-minute cycles of high focus followed by a need for recovery. Working with this rhythm — rather than against it — can produce more output with less fatigue.
Tips
- Plan your most demanding cognitive tasks for these blocks.
- During recovery, avoid screens and movement-heavy activities.
- Three full cycles is a strong day of deep work.
Need a different setup?
Head to the homepage to build a custom repeating timer with your own duration, rounds, and sound — or browse the other popular presets.