I tore my ACL in Jan. 2012 with surgery in March 2012. I was back to full training in Oct. 2012. My PT's said that 6-9 month is normal (and because it is you MCL too it probably will be a little longer)
I'm not going to lie, after surgery is painful and PT is HARD. After surgery I had a nerve block (which really helped, let me tell you) and a continuous motion machine. I was bedridden for about 1 1/2- 2 weeks. Then, I was on crutches for about a month and had my leg in a giant brace for another month. I did pool therapy along with regular physical therapy (the water makes it so you can be up "on your feet" sooner and provides natural resistance). PT was hard and frustrating (after losing 15 pounds of muscle in 2 weeks), but I got through it, and you can too.
Coming back to gymnastics also wasn't easy. PT helped gain my strength back (this finally got back to 100% after 2 years) but I needed to gain my confidence back. A giant knee brace makes things different and suddenly a full turn on beam is the scariest skill ever. But just like PT you can work through these. My knee got tired and ached quite a bit after returning full time (for obvious reasons), but that gradually went away as I regained my "gymnasts strength".
My knee still pains me from time to time, and coming back to gymnastics was not easy by any means. Pushing through everything has taught me not just how physically strong I have become, but how mentally strong I am as well. I'm still doing gymnastics almost 3 years later and doing better than ever! Wearing a knee brace gives me oodles more confidence and I don't even notice it anymore. (plus, I'm told that I look really hardcore in it). Best of wishes to you and your knee in this journey. You've got a great community of people here to support you along the way.
Sorry about the long winded post, I just had a lot to say! Feel free to PM me if you want to know anything else!