The fact that he's going in for both knees at once means that recovery time could take a bit longer. Normally, he'd be able to rest a lot of his weight on his good leg during recovery post-knee surgery. However, now he's going to have to do physical rehab for both knees, which can be a lot more stressful.Don't be surprised if he takes up to 8 weeks to be back to his normal routines. He'll need crutches, a walker, or a cane for at least the first two to three weeks after coming home, and he may not be able to drive for at least 8 to 10 weeks. It all depends on whether or not there are post-op complications, as well as his determination when it comes to rehab.