I have 2 Call Duck eggs in the incubator. I usually have to help them out, due to their round heads, and short beaks. They pipped the air sac at 10:30am today. What is the amount of time I should wait before making a small hole so they can breath. 12 or 24 hours? I had to help out alot of call ducklings last year, but im not sure of the time I should wait. How long after they pip the air sac do they run out of air and die?