In Dark Knight Rises, after Bane defeated Batman, he snapped Batman's spine, or at least sprained it seriously. In the pit, we see someone push his spine (or something) back in.
How long did Batman spend in the pit (in order for him to recover)? The pit wasn't mentioned as Lazarus pit, was it?
I assume at least 6 months, because that was the time mentioned for the nuclear core to be destabilized.