Hunting afternoons can be great, even on bluebird days, but most guys get flustered and leave if there aren't big passes of ducks. Often in the afternoon they start moving in smaller groups (less than 5), not as exciting, but you can usually do as well or better with small passes. In my area first thing in the morning passes can be in the 100s, but even if you are a stellar shot three out of that pass is rare. Think about 2-3 BIG passes won't fill a limit, 20 or 30 little ones no will no sweat. And I have seen guy pack up because "the birds aren't moving", but they are, just in smaller groups.
What I am saying is get a good spot (well hidden/where the birds want to be), and enjoy a few small passes. My 5 and 6 year olds love it! I often have my wife drop one of them off on site, and we will wrap up my limit. They LOVE it!