Originally Posted by BlueLightning
I don't care about the comics. What I care about is what's represented in the film. And in the film, it takes a while. Yes, in movie time, Nolan flubbed the feeling of time (which is a stylistic choice with the editing that he's been doing for the last few films)
, but the visual clues are all there to show that it took Bruce nearly four months to recover from the injury, build himself, and then it took 22 days for him to get back to Gotham.
On top of that, he didn't really have a broken back.