I'd guess about 4 to 6 weeks. Talk to your doctor before starting to excercise. You could really hurt yourself if you start too early.
I agree. I had an open appendectomy two months ago and i wasn't allowed to go to school for 2 weeks (i am only 13 years old) and i was not allowed to do physical activities for another two weeks, so i would say about a month before doing exercise but my surgeon told me that he was being generous saying not to do physical activities because he said i will be able to do them before 4 weeks. So i would say 3 weeks to a month.