Speaking for China specifically, and this is all word of mouth since my kids are at a posh international school (apply hate appriopriately):

Elementary school is 8-5, longish day but not too bad on homework.

Middle school (grades 6-9) there's been a recent drive to have less homework so they stay till only 7:00 (!) doing it at school and only a little take home done between dinner and bed.

High school is your life revolves around homework, everyone realizes it's counterproductive to learning but they're all stuck in this trap grinding for the big exams that will shape the rest of your life. Key word neijuan.

Actual Chinese (and other asian countries) can chime in where I'm mistaken.