The tomato has no evidence

The 25-minute Pomodoro has zero research behind it. It was one student’s preference, set on a kitchen timer, in the late 1980s.

Your biology runs on roughly 90-minute waves. Flow alone takes 10 to 15 minutes to enter — a Pomodoro ends just as your brain arrives.

Work in 60-to-120-minute blocks. Break at natural boundaries, not arbitrary ones.