Sorry--All I've seen is survival information on gunshots, not recovery times. Good question. The only suggestion I have is to follow the advice of Robert L. Forward, award wining physicist, patent holder and hard science fiction writer. "Never let the facts get in the way of a good story."
Since the amount of damage will depend on the caliber of bullet, range, obstructions affecting bullet velocity, composition and design of the bullet I think you would be justified in making up something that sounds reasonable. Also, the world of LAC:TNAOS also has areas of medical science significantly more advanced than our own which further clouds recovery times. Hey, Lex survived and recovered from a fall off a hundred story building and only lost his hair?
Hope this helps.
