I had one little guy recently - unzip in 20 minutes and burst out of the egg- and was flopping around the incubator everywhere straihgt away. So I had to take him out just 5 minutes after hatching. Others have needed a good twelve hours to start taking an interest in anything other than sleeping. They can all be a bit different depending on how much of their strength they used to hatch. I always put some vitamins in he first lot of water I give my ducklings just for a boost, and always have food in the brooder ready for them to eat as soon as they want to after coming out of the incubator.