In Illinois, you can hunt until 1:00 p.m. If you can get a tom to respond very late in the morning or around 12 noon, you've got a good chance of taking him since the hens should have left him by that time of day. I often start with hen yelps followed in a few minutes by a gobble or two, giving the impression that an intruder tom has moved into the real gobbler's territory and is trying to court a hen. This can result in the real bird rushing in to defend his peck order.