Ok so I need a little help...today is day 21 for my 9 eggs in lock down. Yesterday around 3:30pm 1 egg started to zip. I was so excited checking on it like every half hour. I figured when I got up this morning I would have at least 1 chick but I don't. The shell is about 1/2 one side cracked and open to where you can see in. How long does it usually take the first egg to zip? These are silkie eggs if that matters.