Why 15 minutes is the magic number

We used to do homework after dinner. Forty-five minutes at the kitchen table, my son increasingly distressed, me increasingly exasperated. He was eight years old and already telling me he was stupid.

I stopped doing it that way about eighteen months ago. Here is what we do now.

The two rules

Rule one: homework happens at the same time every day, in the same place. For us, that is 4:15pm at the desk in his room, immediately after a snack and 30 minutes of free outdoor time. The routine is non-negotiable. What happens during the time is more flexible.

Rule two: we work in 15-minute sprints with a 5-minute break. Not 20 minutes. Not 30. Fifteen. There is a timer on the desk. When it goes off, work stops. Break is non-negotiable too — no "just finish this bit." The timer going off means the timer going off.

Why 15 minutes

The research on sustained attention in ADHD children suggests that focused work capacity — without pharmaceutical support — is typically between 10 and 20 minutes for children under 12. After that, the brain is no longer learning. It is white-knuckling.

Forty-five minutes of white-knuckling teaches a child one thing: that homework is painful and they are bad at it. Fifteen minutes of genuine focus teaches them something different.

What to do during the break

Movement. Not screens. The break is for the body, not the brain. Five minutes of jumping on the trampoline, kicking a ball, doing star jumps in the hallway. Physical movement releases dopamine and norepinephrine — the exact neurotransmitters that ADHD medication also targets. A physical break is not wasted time. It is what makes the next sprint possible.

Since switching to this system, homework takes roughly the same amount of real time — but my son's experience of it is completely different. He knows it ends. He knows what happens next. He finishes most sessions having actually completed something, rather than having spent an hour fighting himself.