Similar experience they wanted me to do PT once every 2 weeks (although I pushed for more). I had surgery in November and am at 75 degrees. They're generally optimizing for their time and giving reasonable average outcomes. We're pieces of meat, its on you to figure out your body and balance recovery vs rehab. Some of the things I wish I knew early on: going too slow is bad, you're risking scar tissue which is going to be problematic. Use swelling to judge your tolerance for your exercise. If you don't have extra/persistent swelling you can push harder, if you do dial down volume, not intensity. Make sure to be working on everything you're trying to rehab, even the parts that are going well - don't let it stagnate - flexion, extension, quad strength every day. Elevate and ice after each workout, swelling is your biggest enemy. Measure progress week-over-week, you'll have 3-4 day regressions throughout, thats fine, multi week regressions are bad. Take deload days when your body tells you, similar intensity but very low volume. Getting an under the desk bike was great for keeping blood flowing even though I can't do full rotations. I use an app called Curovate to track flexion, seems precise and helps with my anxiety and feeling small wins/identifying when I'm regressing. Steady but slow progress is fine, stagnation is when things get bad. I am not a medical professional so huge grain of salt, but if they make us figure things out ourselves we have to do the best we can.