Perhaps, if you try hard enough and persistence in getting yourself up, I mean not over stretching... just work on your fitness and get you legs back. 3 months is a possible time frame. You have to be determined. I had ACL gone without surgery....before my MRI scan, I was still up and playing badminton, cycling despite all the pain and swell in my left knee.
When the MRI report was out, I was shocked and chickened out. Didn't know what to do, Hesitated for few weeks decided not to go for surgery (insurance covered). During this time, I was already working on my feet, work hard to regain my fitness. However, my confident in executing what I used to do in my game was totally gone.
I was already on a rehabilitation program pending my MRI result. Need to decide whether to go for ACL surgery. MRI scan result took 2 weeks. All in, from the time I started visiting the sport doctor, after 10 weeks, I was discharged. Went for a agility test.... regain my confident because it was essential condition for my discharge. The expectation after such injury, Doctors and physio also mentioned, its not live threatening, but you will never regain 100% of what it used to be.... perhaps 70-80% is already very good. Of course, there is always the warning, over do it and you "rot" your leg sooner than expected. All other advice acme along the way... knee replacement.... etc...