just looked it up 28 days for wild turkey gestation, I had photos of hens getting breed on April 1st.
April 1st plus 10-12 days for each egg laid plus 28 days comes out to May 10-12th, give them another 14 days and they can fly, after that there chance for survival goes way up
It's 28 days from the time she decides to incubate them,so the eggs could have been laid even earlier or she can start to incubate later this is called synchronous hatching. Man google is great ain't it,for me anyway. LOL