I have only hatched duck and geese eggs but they can take well over 24 hours from the first signs of a crack. If you see the eggs wobbling then all is well and the chick is alive, it is always tempting to get in there and help them out but you should only do that once you think the chick is in trouble. It is a game of patience I'm afraid. Having said all that I do have 6 of my hen eggs in the incubator so in a few weeks time I hopefully shall be as anxious as you. Good luck and remember the photo's.