If I averaged it out it would probably be missing three a term in first year (woke up after it had started and didn't want to disturb it by walking in late, I know it annoys me,) then I skipped another as I was revising with a friend in the library. Then I skipped two tutorials because they were pretty pointless and I couldn't stand the tutor, then a further two because my dad was in the area so it was easier to collect me for the holidays then.
This year I've missed more as I had about 6 weeks where I was seriously thinking of dropping out. I think I missed about 12 lectures and 1 tutorial but none of them were this term.