Mannjo, 3-4 months is what my doctor initially told me, I did my own physical therapy and was playing ball again in under 4 months. 3 years later on November 1, 2010 I had a dbl knee replacement and the physical therapy and rehab was beyond intense and i was playing ball the last week of April 2011. I was also back to playing hockey 2-3 times per week. I turn 51 this year and still skate 3 times a week and for the upcoming softball season I will be playing ball 4 days per week.
Its all about how you do your rehab , the more you put into it the more you get out of it in the long run.