He stumbled away from the scene, received prompt first aid from a bystander who tried to stop the bleeding (without much luck), and was taken to a hospital for surgery to remove the bullet. No vital organs were directly hit; one may have been nicked (just for the sake of adding more injury, but I'm open for this). He lost a lot of blood between getting shot and getting to the hospital, and received a transfusion during/after surgery. (He's a B type receiving O, if that makes any earthly difference.)
How long does it take him to wake up after the surgery? Ballpark is fine.
EDIT: Asked a nurse at the blood donor clinic and got an answer! She said that it would heavily depend on what anaesthetic was used, but that it would likely take him about 40 minutes to an hour to wake up, as patients after surgery are typically administered a drug to bring them back to consciousness. She said the only reason he might be kept in a coma would be if they suspected a serious brain injury.
She also mentioned that it would depend on whether any internal organs were hit. I didn't question further along that line, but I got the impression that if an intestine had hit and he'd gone septic, the surgery itself would have lasted much longer. I'm not sure if the waking-up period would remain the same or not in that particular case.
ETA 2: If the bullet had managed to make its way really deep into his abdomen before stopping, does anyone know if the doctors would have been more likely to make an incision in his back to get it out? Or would they follow the wound from the front regardless of how deep it went?