My recovery actually went a lot better than expected, I seemed to be on the "at best" end of the spectrum when it comes to recovery from DI. I never felt any need to take pain meds (and they gave me the strong stuff, so it would have been a big relief, had I needed it to be), and at my 1-month post-op appointment I was cleared from all movement or exercise restrictions, so long as I eased back into the exercise stuff. By then, all my incisions had closed up, no scabs or anything, and my nips were already solid pink and brown, no scabs or oozing (there had never really been any blood or ooze from those to begin with, though).
Now, I'm around 7 weeks post-op I think(?) and I've been hitting the gym and bodyweight exercises regularly. The most discomfort I've experienced is a little tenderness on one of my sides, where it's a little tight from the drain and all that accompanied that. I've been doing weights, running, etc no problem.
So yeah, I mean, I think by 4-6 weeks, exercise will be part of your daily routine again, if you want it to be. YMMV, but if you're young and/or active, recovery will be a lot easier, I think.