First year is the most, since you got math, which is 6 hours per week. Otherwise it should be fairly standard commerce hours, which is about 3 hours per subject per week.
I think the number of days at uni will be more informative:
first years -> 4 days usually
second year -> 3 to 4 days... although 3 days will get you late ones.
third year -> ditto
honours -> some evening (between 5pm to 9 pm classes)