It depends on the uni. Cambridge tends to just publish the times online and they don't vary much year on year, whereas other unis tend to re-timetable every year and it can vary a lot. Usually you'll get your timetable during your induction in fresher's week - although often you may need to go back and forth with the admin team to get everything showing up and so on, or even to get it working at all.
Assume you won't have any time outside of weekends - realistically you should be spending approx 40 a week on your studies, between lectures and independent study, anyway.