He will take its time. I'm not kidding, because quails hop out in 10-20 minutes from piping, ducks take their time (24-48 hours). Now that the shell is open you should expect at least 12 hours. They rest a lot and take their time to absorb the yolk. Don't rush it, just check every 6 hours and make sure the membrane does not shrink wrap on the little guy. Also remember that the towel may dry out, especially is you have a fan in your incubator.
