Just chiming in to echo the study estimates. Everything y’all are saying about variation by grade/individual/workload/teacher is the same at kiddo’s school.
Kiddo is calibrated to do just enough to get the grade he wants - definitely not an over-studier. He had 2-ish hours per night as a freshman and sophomore, largely because math came easy to him and he should have spent more time on writing than he did. He has friends who did things more thoroughly, and they studied upwards of 4-5 hours.
As a junior he cares more about writing, and math requires more proofs and therefore more time. He is taking all advanced courses, and has 4-5 hours of work per night plus work on weekends. His math teacher doesn’t let him get away with cutting corners. His mis-judging math has been the biggest challenge time-management wise. There is a big difference between 4 hours and five hours of homework. This has been the first year he has had to regularly decide what homework doesn’t get finished on a given night.
Junior year is notoriously brutal, and it has been for kiddo.
I talked to some of his teachers about homework load in the fall when he was remote learning. They professed to being very mindful of the stress the kids were under and adjusted accordingly, but it still seemed pretty rough going.