Let your body tell you when it's ready. Don't do anything for long sessions, whether it's sitting, lying down or walking. The leg will tighten up and get stiff if you keep it in one pattern of rest or motion. Just be fidgety, never totally still. Keep changing your movement pattern about every half hour. The knee will heal faster the more you move, but only if it's gentle, small movements. Frequent is the magic word. Just don't do much of any one thing. Also, rely on aids like crutches, a cane, a walker, a wheelchair--they are all good. There is NO HURRY to stop using them. You will be weaker after surgery and much more vulnerable to falling, which could be disastrous. Play it safe. There is no timeline except for what your body can do. It doesn't matter how you compare to anyone else. Of course it's only natural to look around the gym to see how other knee patients are doing and wonder if you are keeping up. When I asked my therapist why I couldn't do what others were doing he gave me good advice: it doesn't matter how anyone else is doing. It only matters what your body is doing. Just take care, be careful, and be gentle and kind to yourself. You will heal when your body can heal. Yours is the only body you have, and you can't make it be like anyone else's. It's not a race or a competition. It's a long, complicated process that takes place inside you at microscopic levels. You will have to try things to see what you can do, but don't rush. You will get plenty of warnings and consequences from your body if you overdo it. Listen to your body.