Hi, I've got 11 eggs in a incubator.2 have hatched. Yay! I'm new to this and the manual with the incubator is hard to understand. How long can I leave the chicks in there for? They seem happy enough. I just want to keep them as warm as possible. I also have another chook that has hatched 9 chicks a few days ago. Could I put the new hatchling with the others or is this a bad idea! Thanks.