My wife is 4 weeks post op on her second TKR. We knew what to expect having done the first one in July, but it's tough. PT is going well, movement is great, everything in the surgery went real well, but the pain is real. It's now time to come down off the meds, I'm not looking forward to the next few weeks :)
The pain seems extremely person dependent. Some say they are up and pain free (relatively) in a few weeks. Others much longer and more pain. Wife's first was probably 3 months to pain free (though it was hard to tell because the other knee still hurt so much). We're hopeful to get back to going for walks sometime after the new year.