I have talked to a number of people who have had a TKR. Recovery times vary all over the place. A few people who have had two TKRs report one quick recovery and another that took many months longer.
One thing seems certain to me is that straining the joint to early and causing additional inflammation and perhaps even damaging some soft tissue is defiantly a big No-No. A TKR is a brutal surgery: cutting, sawing, drilling, pounding, stretching, and finally stapling the huge incision closed. Then the fun starts: pain, inflammation, swelling, etc. Is it any wonder I waited 40 years to get this done? Of course, the alternative is going short distances hobbling along at 1/4 impulse power for the rest of my life. No more Warp Drive for me with the current knee.
Occasionally, I read testimonies about people who have had a TKR and 3 months later are running a half-marathon. Or they are in the gym 6 weeks after the surgery working out on the weight machines to "strengthen' their legs and knees. I have come to the conclusion that these people are either lying or taking a huge risk that might seriously damage their repaired knee.