This time of year with the heat, I have mine throwing 30 minutes before first sunlight and 30 minutes after dark. I've found that if your feed times are later in the morning or earlier in the evening you end up mostly feeding does, young deer, varmints and birds because the older bucks just don't want to move much in this heat.
Walk the night, travel light, cross the Rio Grande
Someone strums a mandolin, soft gulf breezes blow
My new life is waiting in old Mexico
-Robert Earl Keen