Years 1-3 I worked around 30 hours per work. We usually had one day off (or nearly the whole day on Thursday) from classes.
My work hours usually were Mon, Tues, Wed, Fri 6-9pm, Thursday/Saturdays 8 hrs each, and Sunday 5 hours.
Total work week was 3+3+3+8+3+8 (sat) + 5 (sunday) = 33 hours...