90/20 focus timer
1 hr 30 min focus, 20 min break, then a 30 min long break after 2 sessions. 3 hr 50 min total.
What this one is for
The 90/20 focus timer reserves a long uninterrupted block followed by a twenty-minute break. Choose it because that schedule fits your task, not because it measures a biological attention cycle.
The preset runs two 90-minute focus blocks with a 20-minute break between them and a final 30-minute break. That is 180 minutes of focus and 230 minutes overall, or 3 hours 50 minutes.
If ninety minutes is too long, reduce Focus. A shorter setting does not need justification beyond fitting your work and available time. The timer ends after the final long break.
Good for
- Deep work on one problem, with no switching
- Practice sessions for music or a language
- Writing a big first draft in one sitting
- Mock exams and timed papers of about this length
How it runs
1 hr 30 min focus, 20 min break, then a 30 min long break after 2 sessions. 3 hr 50 min total. Press Start, or hit Space. The phase word and icon above the progress bar tell you where you are.
Check the Sound chip and device volume before starting. Work and rest have different tones. The tab title shows the time left. Start begins the first phase immediately; prepare your space first.
Keep the page visible for cues. The timer requests an awake screen, but the browser can refuse it or delay background sound. For offline use, load this exact page online and test a reload without a connection before relying on it.
Change the settings before starting. Durations use minutes. This page opens with its preset each visit; the main timer page remembers your valid settings.
Common questions
Does 90 minutes match my attention cycle?
The timer cannot measure your attention. Treat ninety minutes as a scheduling choice, not a biological limit or an optimum.
Ninety minutes is too long for me. What should I use?
Try a shorter Focus setting, such as 45 or 60 minutes, and check the new total. Choose a stopping point that suits your task; ninety minutes is not a required target.
What if the bell interrupts a useful thought?
Leave a brief restart note and take your planned break, or adjust future blocks to fit the task. The timer provides structure; it does not judge your productivity.
Does it keep the screen on?
The timer requests an awake screen while running. The browser can refuse or release that request. Keep the page visible when sound cues matter.