Yesterday a Hen that has been sitting on 10 eggs , one hatched 5 days ago and is now being very vocal so yesterday 3-4 times I would check on them she would be off her nest , so about 4pm I went outside and got another broody hen and sat her on the eggs , candeled last night, tossed one no development but the others I can see dark with air sack, do you think they will hatch? Should I crack open one that has a baby in it? This is a mystery nest i found outside so I have no idea how long , have heard when a hen sets eggs should hatch within 2-3 days of each other, is this true, thanks for any suggestions