Depends how you work, how well you understand the subject
I had a friend who spent all her time in the library and barely got a 2:1, then another friend doesn't go to any lectures, just studies in their spare time and gets high firsts
I've spent most of today doing work, and tomorrow will probably be the same, but I didn't really do anything yesterday apart from go to lectures as I went out with friends in the evening. You just have to do as much as you want
The uni recommends that a 10 credit module is equivalent to 100 hours of work, but that includes the lectures, workshops, seminars, extra reading, revision etc.
But we haven't even met!