It didn't go all the way through, but it did go rather deep. No vital organs were hit. Non-vital organs may have been hit, as there are quite a few of both in the stomach region, but I never exactly go into the details of the injury, so that's up for...whatever.
Obviously, he lives, with no comatose period or anything like that, if that gives you a frame of reference for how seriously wounded he was.
ANYWAY what's the time frame I should be looking at here for a recovery? He's a young (24) soldier, so he's pretty fit, good health and all that, and we do have the aid of priestly magic so timeframes can be fudged a little.