12 hours is fine, I think. You can keep giving him drops of water if you wanna make extra sure he's okay.He hatched just yesterday, a little over 12 hours ago. I know they can survive off of the yolk they absorbed for a while but I don't want him to get dehydrated since he is already pecking at the feed. And I'm not sure when he should start pooping? He doesn't have pasty butt.
Not sure on the pooping question... Honestly, I just enjoyed that no-poo stage and never worried about it or timed it.