For my MS2 year...perhaps around 3-5 hours per night during the weekdays, and during the weekends...it depends if there is a major exam or not, but I'd say 10 hours and more during the weekends. Sometimes there are light weekends, where I try to catch a movie, have dinner with friends, or go shopping if I have the time...it's a rarity though, like 1 light weekend per 1-2 months.🙂