Anyway, as the key word is school and not uni, my answer is 0
You mean, you skip uni? Why would you do that?
wow. i live on campus and i still go to essentially none of my classes (for two of the courses i did in the last semester, i went to a grand total of 4 lectures). the only time i've woken up before 1pm in the last two months was for my exams. uni classes are different from school classes in that
a) you're not obliged to go
b) you're rarely assessed (in lectures, at least)
c) most lecturers put up lecture notes on the intertubes after each lecture
so really, there's very little incentive in going to a lecture unless you don't understand the content otherwise.
i barely wagged school at all - i used to sleep in on wednesday mornings in yr12 when i had a triple study period (which we were supposed to attent - roll call in study periods and all that). and i wagged a friday afternoon once to go to the cricket. and i'd skip RE to go practise music. but in general, i rarely skipped class, just used to talk through them all instead.