It amazes me each year about hatching of peachicks. All adults are on the exact same ration. All eggs are collected nightly,labeled,then put in my wine fridge set on 60 degrees. All are turned no less than 3 times a day until they go into the incubator. Within each collective weekly group of eggs set the diffrences are unpredictable. Same variety of birds and possibly 10 eggs from that variety all began incubation at the exact same time,all treated the same and of those 10 eggs possibly 2-3 will pip-zip and be doing the texas 2 step within 3 hrs from start to finish. The other 7 may pip and then do absolutely nothing for 24 hrs or more.Some are wrong enders as well. And I would just bet on some occassions the same hen laid one egg that took 3hrs,start to finish and another one of her eggs possibly pipped and was too weak to do anything else in the same weeklu group of eggs set.