I went out for 4 - 7 hours and the chick was already independent on eating and drinking. It was 5 days old. It already imprinted on me within a few hours after hatching. If it helps, there was only 1 chick that hatched out of 20+ eggs, which is odd and I know it wasn't just a weird thing, it happened three times and 1/3 none hatched out of 16 eggs. Some sites claim that you should leave the hatched chicks in the incubators for up to 48 hours because of the yolk that is stored in their body but if thatbwas true, it would not seem very sensible for a hatched chick to stay longer in the incubator than in the brooder. It didn't die of starvation or dehydration however as there were food & water in the brooder.