Jen
KurJen - Kurgan Mod
They hung him by a rope and socked the disc back into place. Realistically, it would've been months before the spine and nerves healed if at all, not 10-20 days. And that's not even dealing with the months of rehab needed afterward.
I'm not sure if this was addressed - didn't read all the pages - but Bruce was in the pit for many months not 10-20 days. If I remember correctly when they removed the bomb the battery would keep it stable for 5 months and Bruce was already in the pit at that time.
While you may have a valid point, Batman Begins never really does tell exactly how long between Bruce being back and the first sighting of the batman. Could have been a week or six months.
I would say it took several months. There was a lot of planning between Bruce and Alfred to accessorize and customize his batsuit.