I have been incubating mallards for the first time. Some have broken into the air space, and have pipped, how long will it take for them to get out. They don't seem to be getting very far, and it has been about sixteen hours. Also, can anyone give me a simple walkthrough on egg incubation so that I may be educated. I had a problem when I noticed that these black blotches appeared inside the egg on the small end at day 22. What was that exactly, b/c the first thing I thought of was a vast amount of bacterial growth. This is my first time, so please help me know what to look for to determine healthy chicks. (this post is very sloppy, lol). Is it true that mallards are some of the hardest to hatch?