I have just had my first orpington eggs hatch, 1 week ago, first one came out really quickly and I thought that was how they all would appear..not so, second hatched between 11pm and 5am, but no pip at 11pm so must have happened quite quick, third took about 8 hours, the fourth piped and nothing for 24 hours, just a little beak,has yours split the membrane at all? so I did what many people say dont! and peeled a little more of the shell and damped the membrane, it still took a further 3 hours and the chick is fit and healthy, but quite abit smaller than the others, this was the 24 day so quite concerned as a full 48 hours between first and fourth, I then candled the remaining 5 eggs, 2 had turned to liquid, and the other three had formed but unmoving chicks, so I disposed of them without opening, I now think I should have looked further in helping, BUT and a big BUT, the one having problems is smaller, which will make him weaker, very difficult to know whether to help, some say never, others say yes, there is a forum on here 'chicks not hatching' which made me think and is very helpful, I have another 9 incubating now so will see how they go, I think I should have given the three eggs longer, I just assumed if four had hatched in 48 hours the time lapse between chicks was too long, that they should all hatch around the same time, if they are all late then fair enough but to get such staggering seems odd. There are stories of people killing the chicks by trying to help when the blood vessels are still conected and the yolk not absorbed even though the egg had pipped hours ago, they were resting and still absorbing the sack,Tough call, hope you get some info from the other forum:/