I remove mine about an hour after they hatch. I never leave mine in because the brooder plate or heat lamp dries them off better than a humid environment.
They can stay in for 24 hours or so. They absorb the yolk and that supplies their food. I do like to give my chicks water an hour or so after they hatch because they're usually quite thirsty. I like to give them electrolytes too because they use their energy trying to get out and need a boost.
Everyone has their own way to do things.
last year my ducks were y’all enough they were drinking from my extra humidity bowls as soon as they were standing.
I like to take them out often but I am thinking my particular incubator doesn’t. Because of timing and engagements I had to let my January marans hatch stay in the bator and i had my first 100% hatch with zero assists.
My broody seems good. Four hatched under her so far. Incubator chick I’m going to check now.