I think of it like this. Over the years I have used broody's to hatch eggs and they usually get off of their nest for 15 to 20 minutes daily to eat, drink and poop. I usually don't candle until I set the eggs for hatching. Haven't had a problem yet.I wonder how to get the eggs all candled without letting them get too cold. If I take them all out they will get cold so maybe take half out and then do the other half? And when it is lock down I will have to take them all out so I can remove the turner. That scares me too. LOL