I have mentioned in another post that I have a broody chicken hen that just started settin (5 days already) I hope to pick up some guineas next week if the hatchery has them. She will have been setting for about 10+ days by then. I have her setting in unfertalized duck eggs right now. I hope to pull those out and put the guineas under her. I just wondered if they had to set the full 21 days or they wouldn't know the difference? Anyone cheated their hens out of setting days and how did they do?