My son is in last year of Junior School (he is almost 11 y.o). He currently gets about 30 mins a night- which I resent.
Anyhow, in Seniors (High) I am guessing 2 hours a night will be the norm. I look at the curiccula being studied, and despite all the other non-academic stuff that takes place during school time, I am still at a loss to understand how it cannot be taught in a 30 hour school week. I wonder if it is more about preparing them for the world of work, where bringing it home or working late, is the norm. Kids need time to explore their interests, to educate them as 'whole' people, not just exam passing, teacher pleasing automatons.
By the way, I managed several teams of guys in IT. If any one of them couldn't leave the office on time I was asking them why they couldn't do the work during normal working hours. If they couldn't and were obviously not shirking I would request further headcount. (Obviously, not if a panic was on in which case it was all hands to the pumps)