I set some eggs 23 days ago. At day 3 and 7 two eggs were veining nicely. Around the 15 day mark one egg was losing its veins, no movement, etc. I took it out and sure enough it did not develop past a kidney bean. On day 18 my lone egg was rocking and I was excited at what the next 3 days would bring. Tonight marked a full 23 days so I candled my lone egg and there was no movement at all. I opened it up to find a tiny dead chick with a body cavity that did not fully close. This was my first hatch. I had some slight variations in humidity but no change in temps at all throughout the 23 days. Tonight marks the start of a second hatch. I have 3 silkie eggs, 4 white leghorn eggs, and 5 brown leghorns all from my own flock. Here's some success the second time around. I will be anxious for May 1!