In my opinion, a couple days is too many. The powder itself may not be too corrosive, but it attracts moisture. That will start some rust. Once it starts to rust, you will eventually be screwed. I have let them go till the next morning after an evening hunt, but that's it. My oldest Hawken is around 22, and still looks great. I shot that thing a LOT! Cleaned it a lot, too. With hogs, I guess you would shoot more than a couple of times, too. I would swab every third shot.
