Tanker question ???

4-5 hours? Not the case with fuel anyways, maybe 45 minutes to an hour unless your doing a pump off load. In that case your in the cab watching out the window and in your mirrors at your hoses with an occasional walk around. Pretty gravy if you ask me. Only downfall was when we would haul #6 oil and it was real cold, some of those bigger hoses would feel lile you were trying to bend a 2x4 piece of wood. Not many places burn that anymore.