Chicks will take a few long breaks during the hatching process. They will break after internally pipping. This allows them to practice breathing and to start absorbing the yolk. After about 24 hours, the oxygen will deplete and carbon dioxide will increase. The carbon dioxide buildup triggers the hatching muscle behind their neck which causes them to start pecking at the shell. Once they have pipped externally and now have more oxygen, they will take another long break. This break is a crutial one. This is the break the allows the yolk to finish absorbing and allows them to regain their strength. At this point you may see their beaks making and chewing motion. This means that they are still absorbing the yolk. Once they are done absorbing the yolk, they will begin to unzip the egg. This is a process that make take hours or even minutes. Once unzipped, they will take another small break before finally kicking their way out. It could very well take 24 hours or longer once they have externally pipped. Just be sure to monitor the chick and make sure that the membrane is not dried out. You don't want the membrane to turn brown and brittle. Your egg looks fine at the moment as long as you are still seeing movement.
