The handbook has a total time commitment posted for every subject, so just divide that by 14 or whatever to get you avg. time commitment per week for each subject. That's generally the maximum most people would spend on a subject (and includes contact hours).
But in reality, it's a fluid thing. You can try to have a constant workload but its not the most efficient way to go about it.
The first two weeks you'll barely have any homework to do other than doing readings, then as you get assignments it will ramp up a bit, then it will get a little crazy, then slow down a bit again with the Easter break, and then pick up again until the end of exams.
But ultimately, it's up to you. People have different priorities. You can study as much as you want, but if it means you have less time to develop new friendships and relationships, or if you put study above you mental and physical health, it's probably not worth it.