Every person is going to be different and every surgeon will have their own protocol, but by around the eight-week mark you should be transitioning into tennis shoes (out of the "boot") and starting to slowly ramp up your activity ("gently walking for exercise").  This doesn't mean you're fully recovered, though.  The inside of my surgery (bone, screw) was fully healed, but I wasn't good to go yet.  By around 12 weeks you may be cleared for normal activity, but I had a setback around that time, so it's not a sure thing.