Hmm.. My boys never had that quantity of homework.
Much younger they learned to categorise homework set:
Priority 1 - an interesting task that will further learning
Priority 2 - an important task, required to embed learning, or to be built on in a future lesson
Priority 3 - a task with little meaning for me, but the teacher will mark it
Priority 4 - a task with little meaning for me; the teacher may check it has been completed.
Alas there was a fair quantity of 3 and 4 from teachers who were told they had to set homework. They rattled through 3 and 4 (often at school in breaks or frees) to do the bare minimum to avoid getting in trouble, so they could focus the time they had on the real stuff - 1 and 2, plus optional, independent tasks.
This approach served them well and they were 'successful' in school.