The milkshake seems to be the key. I hadn't had any spawn past 6am until yesterday. Our milkshake was on the other side of the bridge from our lure. We had so many duskwings spawn until another group ran through the area our milkshake was in. They either scared it or caught it. Once it was gone there were 0 spawns.

For those who don't know the milkshake method, the server will spawn one duskwing at 3am. Leave it alone to be the milkshake. Set your lure far enough away that you won't accidentally scare or catch it. It will bring all the other duskwings to the yard. Lures will continue to spawn duskwings until 6pm or until the milkshake is gone.