> Did you go to two schools with the same length of day but different number of students per teacher? Not as extreme a difference in number of students or leng

> Did you go to two schools with the same length of day but different number of students per teacher? Not as extreme a difference in number of students or length of day, no. I realise this is anecdotal, just proposing a theory that makes most sense to me. I suspect you're right that there's a sweet spot on all of these things. The school I was at that did ~8:30-4:15 (vs ~9-3:30) also had half a day on Saturday. I distinctly remember the Saturday morning school causing more burnout feeling than the longer days during the week. Partly that will have been because of the weekend things I was missing out on, so it's hard to accurately judge, but I don't think 5.5 days of school was a good choice there.