I live in New Zealand. I had a visit from the physiotherapist while I was in hospital following my TKR. She showed me a few simple exercises (ankle pumps, heel slides etc), then helped get me out of bed and showed me me how to negotiate stairs.
After that, no physio for 4 weeks - I just followed the instructions on a pamphlet they gave me on discharge from hospital. Little and often was what the pamphlet recommended for doing the exercises. I did very little, very often!

Actually, I'm a fidget and there was very little time when I was not moving, but I've never been good at organised exercise.
At 4 weeks, 6 weeks and 8 weeks post-op, I went to PT at the local hospital. There the physiotherapist tested my quad strength, measured my range of movement (she wasn't obsessive about it) and showed me a few more exercises to do at home. Sometimes, I remembered to do them! I was really very slack about exercises, but I did walk around the house, then (as I progressed) around the garden and up the street. I did concentrate on walking properly (heel, toe, push off) and trying not to limp.
I had an uneventful recovery and I now have a knee bend of about 130 degrees and can straighten the leg fully.