Deep Work 240-Minute Timer

What is a deep-work block?

A long, single-task focus session — typically 45 to 240 minutes — with phone hidden, notifications off, and one objective. The preset auto-starts so there is zero friction.

What is an ultradian rhythm?

Your brain operates in ~90 minute peak-focus cycles followed by ~20 minutes of recovery. /timer/deep-work/ultradian-90 and ultradian-120 align practice with this natural rhythm.

Will the screen stay on for a 4-hour session?

Yes. Wake-lock is engaged automatically while the timer is running so the display never sleeps mid-session.

Can I run ambient sound during deep work?

Yes. Blend brown noise, rain and lo-fi at any volume — the soft completion chime still cuts through cleanly.