How long to wait to go back to sports after hamstring injury?

In early August I had a hamstring injury that hurt very bad at first but I iced and took ibuprofen for a week and I was able to walk perfectly fine and I went back to working out and such but didn't test it running. Then I had baseball tryouts in September and sprinted for the first time and hurt it again... This time the pain lasted much longer. I went to an orthopedic and he said that it was partially torn but nothing major that would need surgery just to stay off of it for another couple of weeks which I did. I then tried to play basketball and right when I came off a crossover and tried to run the court I felt it pull again. This was in the middle of October and since Thanksgiving I have been working out again (no leg workouts) but I have been doing biking.... How much longer should I wait before I can start running and playing basketball again?