It is very location specific and subspecies dependent from what I've seen. Probably half the states I've hunted allow all day hunting and now most of them allow all day hunting at least some point in the season. Southern Easterns I haven't had a ton of luck in the afternoons. Mostly because I couldn't stand the heat and the bugs to hunt them much, but I have killed a couple in the 12-3 range when I had a bird going earlier and stuck with him. At least a couple were with hens and they eventually lost them and came looking for me. Rios that I hunted in Texas were every bit as fired up in the afternoon as the morning, albeit without the massive roost gobbling, but honestly most of those roost birds shut up as soon as they hit the ground anyways. I will say the birds in the afternoon didn't gobble as much, and one never gobbled once. He came in spitting and drumming while I was calling sporadically taking a siesta under a tree. Nice way to wake up. I have had much more luck with Merriams in the afternoon. The birds I hunted flew down so early it was nearly impossible to get set up on the roost before they hit the ground. Sometimes they flew down while I still wished I had a flashlight to navigate. They seemed to move away from the roost fast to wherever they were headed. Best gobbling and working the call was always noon to 3. The states I hunt in the North are now starting to allow all day hunting the last 2 weeks of the season, and I've had mixed results. I've killed quite a few birds that came in just as hot as first light, but spent quite a few days where I didn't hear a peep in the afternoons. I will agree with some of the posts above though. If I get a bird to answer a hen call 2-3 times after about 10, I'm going to kill him more times than not.