A lot of variables. Depends mostly on where you're setup for your morning and afternoon hunts. I've killed 90 percent of my bucks on morning hunts. None of which were sitting over an open field. Find little pinch points, draws and funnels leading to their bedding areas. Pay attention to the wind.
I'm not much of a field edge hunter. I dont' care to see the deer come out 5 minutes before shooting light expires. They have to come from somewhere prior to that. Get back in the timber a little bit and invade their staging area.