I guess different procedures require different down times. I started road riding (screw the indoor trainer) 1 week (directly following first post-op checkup) after arthroscopic knee medial meniscectomy. First day four miles, skip a day, then eight, skip, then twelve, and so on up to my usual daily 20 mile ride. Speed kept to about 80% of normal, riding low gears. "Relatively" pain free except for trying to climb any incline or pedal standing. Fortunately, I live in Flatland, so all I had to do was avoid overpasses and bridges. After about two weeks, no problems. OP, see how you feel, and get back on as soon as you think you can and doctor doesn't freak. I would't be surprised if he/she gives you a go ahead sooner than you think. Get well soon.