Hi,
It varies depending on the university and you would normally need to check the university website. With most universities, you would go in more than twice a week for an undergraduate course. I study a humanities/social sciences course which has less contact hours than a science course but I still have lessons 4 days a week.
It is also worth thinking about that even if you do not have any lessons, you may still be going on campus either to study or to go to societies. So, you may find you are still going in everyday.
Best Wishes,
Gulcin
2nd Year PPE Student
University of Southampton.