If you dont want to cut an they havent pipped by day 60 i would make a small cut in the eggs as they may not of developed an egg tooth or the shell could be harder than normal an they cant escape an drown. I cut on day 50 an make just a small window give a little poke with my finger to make sure its alive an then leave it in the bator till it comes out. the only time i will hack an egg up is if the baby is dead an im trying to figure out what went wrong.