Most of the hunters in SE MN and SW Wisconsin hunt private land as there isn't much that isn't private. It may be different where you live and hunt and there may be more or less gobbling activity in the evenings. Over the years, I've tried to get out there about an hour or so before dark and observe. I find a long valley where I can see and just setup and listen and watch. I've roosted a few by sight and a few by sound but there were many evenings where I didn't hear or see anything so be prepared for that. If nothing it passes the time before the next morning's hunt and time in the woods is always time well spent. In two seperate late season hunts, I managed to roost and kill two gobblers that flew right down to me so it can work after some soft clucks/purrs and then giving them the silent treatment. The majority of the birds I've taken though have been from 7:00am to 3:00pm.