We just let our hens sit their own eggs for the first time. They laid for 2 weeks before they started sitting, and then, we expected chicks @ about 28 days (standard cochins). The blue hen took 32 days & the white hen's didn't hatch until a week after the blue one... If your hen will let you...
We incubated some eggs from a friend's flock, and naturally ended up with too many roosters (3 roosters, 2 hens). They are a year old now and the roosters have started to try to determine who is the "big man on campus" so one of them has to go. So far, it is just the two blues that are trying...