My opinion only, but I think once or twice a week is more than enough. (With that, if insurance will pay for 12 visits in three months, only schedule once a week.) The idea is to work on problems you're having getting your life back. All of my PT people were able to give me things I could do at home on my own to improve areas of concern.
My physician prescribed 16 sessions, which worked out to eight weeks at twice a week. For me, that was more than enough. Half way through, he told me I could stop the PT anytime I wanted. I let it go until the end, because we were working on things I found helpful for me until then (although I was ready for it to end by the last session.) I continued for another two months with self-directed pool therapy averaging once a week, and I think I'm done with that for this year now, too.
I didn't have bilateral, but after the first few weeks, I think there might be some similarity in recovery approaches. My sessions were for one hour at a time and included a 10 minute warm up on the recumbent bike and closed with ten minutes of icing (not enough, but I took it when offered). In the middle, I did about five or six other exercises targeted for specific areas of concern. If any of them hurt, the PT changed to a different exercise designed to achieve the same goal but it didn't hurt. They made enough variety so I didn't get bored. Except for the few weeks when they massaged my ligaments (which did not hurt me), they never touched me, even the three times they made measurements (beginning, middle, and end of my time there). Yes, my PTs were not numbers obsessed. I think they eyeballed where I was at, but they only made measurements at rare specific intervals.
They didn't completely adhere to BoneSmart views, because they advocated three sets of ten reps and sometimes put small weights on my ankles. Each time, I approached with caution, but never did I experience any pain during or after (except the one time they had me walk backward on an inclined treadmill. I came back for the next session and told my PT, and his response was, "We won't do that again!" And we didn't). Usually, they erred on the side of lighter weights.
At three days a week for two hours at a time, I can certainly see why you don't want to go anymore. What do you feel you're achieving during PT? Are they addressing concerns you have, or are they just throwing exercises at you and you're doing them? If all your concerns have been addressed, I'd consider stopping PT. If you still have things you're working on that are helping you, consider reducing frequency and duration of each session.
United Kingdom
I'm glad you haven't done any permanent damage. 
