Last spring, my two magic times were 5:45 pm and 7:25 am.
If I was at a fencline near one of the water holes by 5:45 pm, I would have my first hog by 5:50, and my second would be loaded in the truck by 6:00.
Near a roadway, the magic time was 7:25am. The hogs were actually there by 7:15, but they were real nervous about crossing that road and the open area beyond. So it would take them a little bit to gather their courage. Finally, one would get a little careless and poke its head out a little too far.