Least amount of time spent in class (and doing well in it)

[TomCollins]

What is the least amount of time spent attending a class that you still managed to do well in (A or B I suppose)? I noticed some colleges are having attendance grades (wtf is with that), so for all of you suckers, guess this thread won't help you.

As for me-

I had an Operating Systems Lab that I attended for about the first two weeks before I realzied it was 100% lab grades (submitted electronically), and nothing useful was covered in class. I stopped attending and managed to go a total of 4 classes (out of about 30). Finished with an A.

I signed up for the same instructor for the continuation of the class the next quarter. I picked up the syllabus on the first day, and was never back. Ended up with a 100% in the class. 1 class out of 30, not bad.