I've killed a few in the evenings over the years and generally I have found that in the woods, if he responds, I kill him. In a field though, they generally just strut until they fly up. Like was said early, I try to set up 30 plus yards out of the field in hopes he comes looking for the hen.
As far as time, I killed two birds a few years back that I had to really focus on the beads it was already so dim lighting.