We just had a hatch on Monday and early Tuesday, and ended up with a few eggs that didn't seem to be doing anything but we left them in the incubator "just in case". This morning I noticed some pipping in one of the eggs and within a couple of hours we had a healthy chick hatch 3 days after the hatch date! Boggles my mind, but it just goes to show you that you never know how long some of them will take...