I had surgery on my right knee 2 weeks ago... just wondering how quickly did you recover?
It's usually 6 months, but it all depends on how hard you rehab and what level you want to return to. I did rehab on a regular basis to get back to playing for my college team. I was running and doing weights after a few months, but it's another thing to run backwards quickly, to cut, and to play in a match. When I started playing 6 months into it, I still needed another month or two to get properly adjusted to everything. You have to learn how to trust your knee again. To this day, things are not the same. It's been 3-4 years and I still don't feel like I used to. I used to cut freely and never think about anything. Now I have to think about my moves and my knees get sore sometimes. It's not bad though, I can still play normally.
I'm taking a some nutrient pills now which help my joints a lot.
CJ_Speed - check out this nutrient. I think it can help with your knee issues as well. It's highly rated and gives you lots of vitamins and other things that help with joints and general wellness.
http://www.amazon.com/Controlled-Labs-Orange-Triad-Multivitamin/dp/B00104I5TS