I drive 610 miles to my home town on a sort of regular basis, mixing 70-75MPH interstates with 55MPH highways as well as some "city" traffic, stopping twice for pee/fuel at 20 minutes per stop, and eating while driving. It always takes 9.5-10 hours. That's in a car with cruise control , heat and AC, and I'm beat. I've done the same distance down the west coast on a bike, and it took about 20 hours.