Michael Rosen has a point.
Finish at three o'clock, to do two hours' homework? Why not finish at five o'clock, then?
Do several hours of homework per day during the three months that the schools are on holiday? Why not be in school for at least part of that time, then?
Meanwhile, schools are increasingly convinced that they own the evenings, the weekends and the holidays. But in fact, it was recently ruled that 90 per cent attendance was legally acceptable.
That leaves every Friday afternoon, or every other Friday all day, in which to get an education instead.
Oh, and note that at least an hour of every week's curriculum time is still given over to sport, as if the people who wished to play it had no other hours in the day, or days in the week, or weeks in the year.
Take yourself off during that, and read a book. Or even write one.