How long can the chicken leave the nest without the embryos dying? We've had several batches of babies and broody chickens and one chicken got off the nest and climbed into another. We don't know for how long, but the eggs weren't warm to the touch. It's been in the low 60's in the coop today. I did shine a flashlight on them and can check again in three or four days to see if they look any further along than they do now, I guess. Today is Day 6 or 7.