[Neil]

Originally Posted by steeljack

..I'd be interested in someone telling me how a clutch of eggs layed over several days allways seem to hatch at the same time , (I thought incubation times were allways the same length of time, maybe I'm wrong but I don't think a hen can lay more than one or two eggs a day but they seem to hatch at the same time )........don't think we studied that when I was at skoo

It is because the hen only start's to incubate when she has laid the whole clutch of eggs. The incubation time is from when the eggs have been warmed to the correct temperature.