For time blockers
A time blocking timer that proves the block worked
Time blocking is only as good as what happens inside the block. A 90-minute "Deep Work: Writing" block on your calendar means nothing if 40 of those minutes were Slack. TimerDuel runs alongside your blocks and tells you the truth.
How to time block with TimerDuel
- Plan the day. Block out your calendar — deep work in long chunks, admin in short ones, real breaks between.
- Open TimerDuel for each block. Set the block's length. Hit start on focus.
- Tap break the moment you drift. No guilt — the honesty is the point.
- Review the focus rate. If "Deep Work" blocks routinely come in at 50%, the block was too long or your environment was wrong.
Why most time blocking fails
People plan beautiful calendars and then quietly drift through them. Without measurement, every block looks "done" because the clock ticked past. Add a chess-clock and suddenly each block has a score — and scores get optimized.
See also: deep work timer and the chess timer method.
FAQ
What is time blocking?
Time blocking is the practice of pre-assigning every hour of your day to a specific task or category — instead of working from a to-do list. Pioneered by writers like Cal Newport and used by Bill Gates and Elon Musk, it forces you to confront how much you actually have to spend.
What's the best timer for time blocking?
A timer that measures real focus inside each block, not just elapsed time. TimerDuel runs a chess-clock during your block, so a '90-minute deep work block' shows what percentage you actually spent in deep work vs. drifting.
How long should a time block be?
60–120 minutes for deep work, 25–45 for shallow tasks, 15-minute buffers between blocks. Don't schedule more than 4 deep blocks in a day — most people can't sustain more than ~4 hours of real focus.
Is TimerDuel free?
Yes, completely free with no signup. Open it for each block, hit start, see your focus rate at the end.
How does this differ from Pomodoro?
Pomodoro is rigid 25/5 chunks. Time blocking treats your whole day as a calendar of intentional blocks of varying length. They pair well: use time blocking to plan the day, use TimerDuel inside each block to measure real focus.
Run your next block honestly
Free, no signup. Open it for every block.
Open TimerDuel