16 weeks, and I have a mixed report.
I took a 3-week trip to visit my family, and proceeded to eat too much and not get much exercise, and basically completely neglected my PT. Now, at 4 months, I am more uncomfortable, less strong, and in more diverse pain than at 3 months. I am sort of disgusted with myself. Instead of relishing physical activity and doing more and more, I am hobbled, limping, and in pain. I haven't started using a cane again (well, I actually did for a trip to the Monterey Bay Aquarium a couple of weeks ago). My piriformis and adductor muscles are stiff and painful most of the time.
I guess a 3 week total break from PT can do this. I am not worried, although a friend of mine who had a mucked-up knee replacement (with symptoms presenting at about the 3 month point) is telling me I should go see my surgeon. I think I just need to buckle down, increase my PT despite my discomfort, get back in the pool (literally), and walk my two miles a day. I have already lost 5 of the 10 lbs I gained just from getting back to normal eating and a little more exercise and PT.
My partner is very supportive, and tells me not to be too hard on myself. So I'm not, I'm just trying to make up some lost ground.