I won't go to the field until 2:30 or so if I'm hosting a hunt; the exception can be if it's cloudy or cool.
I went on an opening day hunt that a cousin hosted several years ago and birds were flying everywhere at 11:30 when I got there. He put us all out and told us not to shoot until noon. My watch said 11:55 when guys started blasting at them. I left the field before 1 pm with my limit and got home in time to watch football. Shoots like that are rare for me.