This was a kind of accidental brooding. I have a hen that tried to sit in February in Iowa and I promised her as I removed the eggs every day that she could sit in spring if she wanted. Well, there came a day 3 or so weeks ago when I noticed that she was attempting to sit again so I threw a few more eggs under her (for a total of 6) and wished her well. A couple days ago I heard some pipping from under her so I moved her to a private nursery with her eggs and again wished her well. She is sitting and hatched one chick on Monday evening and another on Wednesday sometime. She is still sitting on 4 eggs as of Thursday morning. She is in a private nursery of sorts with her own water and food also accessible to the chicks. My question is, how long can I let her sit hoping for another chick or two? Are the chicks getting anything to eat and drink when mama does? When do I need to pull the plug on the unhatched eggs? Any input greatly appreciated. Thanks!