I had a partial tear, ended up not getting it operated on as the surgeon said it was about as good as a repaired one.
I did it in October, did heaps of physio and exercises, skied in January and it sucked balls. It would feel completely sweet most of the time and then one little thing would remind me that it was not at all happy. Particularly spins that weren't perfect (which is all of them for me), but if you hook an edge or fall you'll know about it.
Personally I'd give it at least 6 months post-op before you start going hard on it but that depends on a lot of factors, like how much muscle and flexibility you lose before and after surgery.