READY
READY
Forty-five minutes is a school period, a therapy hour, a gym session and the length of one side of an old cassette. It sits in the useful gap between the pomodoro, which ends before deep work really starts, and the ninety minute block, which is more than most days have room for.
For work it is long enough that you will stop noticing the timer, which is the point at which a block is doing its job. For teaching it is the standard because attention starts to fall off somewhere after forty minutes, and a lesson that ends on that edge leaves people feeling capable rather than drained.
The tip: put the break in the calendar before you start the block, not after it ends. Forty-five minutes of real concentration produces a strong pull to keep going, and the sessions that follow an unbroken run are reliably worse. Decide now that this one ends at the ring.
Press start or the space bar. The tab title counts down, so you can bury the window and still see the time left.
Because it fits an hour with time to move between rooms, and because attention reliably starts to drop after roughly forty minutes. The number is practical rather than scientific.
Ten to fifteen minutes, away from the screen. The break is what makes the second block of the day work; skipping it borrows from the third.
Not from this page: one interruption is the design. If you want a five minute warning, run a forty minute block and a five minute one after it.