i also want to share my experience with you. My daughter is studying at old YMTCPS . She will be P.6 on next year.
She is on top 5 of both whole P.4 & P.5, and she is 1st on P.2 . But for past five year study, the homework was really not so much. Usually, everyday, she just spend 30 min to 1 hour to finish the homework at home, most of the homework she has finished at School.
When she were P.1 , I will help her to check the homework to sure the answer was correct. But from P.3, I didn't check her homework anymore. Sometime, she don't know how to do the homework, I will tell her how to do, but not often.
And frankly speaking, I don't let her to have any 補習 class or have any 補習 teacher. I only help her to revise before the examination.
So pls don't worry too much on the amount of homework.