How long does a dislocated knee cap take to heal before i can do sport again?

i dislocated it about a week ago and the doctor said that i need to complete 3-6 months of physio-therapy. There is basically no pain at all when i move it or walk on it. It only hurts when i bump it or push on it. Sometimes it hurts when i straighten my leg but not all the time. I just want to know how long it will be before i can do sport again, i do sports aerobics which includes a lot of jumping and flexibility.