I had an unload years ago that took almost 30 hours. I believe it was one of the "flocs." Product had to travel very far and then upward. It was going into the tank thinner than a pencil. Then you have the rare load where you have to wait 1 or 2 days to unload and there might not be a truck stop nearby. Other than that, any load that requires me to be on I-95 between Boston, MA and Richmond, VA is the worst lol.