@emb123 I had my second TKR in October, 2017. I can't remember exactly how long I had PT for but I know it was done a couple of weeks before Christmas, so I am thinking 8 or 9 weeks total.
After outpatient PT I did keep up with the exercises at home. It sounds as if you are probably beyond the point when most people stop PT, unless you have a problem that is not typical.
JK