It was common to get at least a book's worth of reading a week for the humanities oriented classes at my undergrad. Always fun seeing the freshman morale sink a few weeks in when they realized they had to either skim aggressively or do ~10-20 hours of reading.
Of course, those suckers got to avoid the hard science lab time, so good for them.
Rule of thumb for my college classes was 3 hours of outside work for every hour in class. So 3 hours of lecture per week = 9 hours of problem sets, reading, etc. That was 50 years ago.
Of course, those suckers got to avoid the hard science lab time, so good for them.