One of my Easter Eggers is spending a lot of time on the nest. So set up a large bin and put in it a nest box with a couple golf balls, food and water. I originally wanted to do this with my Silkie but she's not in the mood To my surprise the EE went straight for the nest and has remained there . TSC is starting to get chicks in the first week of March. Seems a bit early for shiping chicks to Maine but it is what it is. My questsion is : How long does the EE need to set before I can slip some chicks under her?? Does it need to be the full 21 days?