I think it largely depends on the stage and the faculty or course - my Mum told me that for some of her Stage 1 modules, she had live tutorials every month. By Stage 2 and 3, the frequency had decreased to maybe 1 or 2 for the year. (She was, however, studying part-time, and that was a social science degree.) When module websites open, you might have more information, or you can ask your tutor when you get those details.