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About 10 hours with a road ready, well maintained and reasonably modern motor vehicle.

Most skilled drivers can achieve an average road driving speed of between 60 and 65 miles per hour on the US Interstate Highway system if the route is free of detours, road accidents and bad weather. Expect faster average speeds on the German autobahns or a NASCAR oval. Plan on the average driving speed being reduced if the route includes extensive city, residential area, mountains, farm to market or county roads, two lane state highways and construction zones. The passenger manifest can also be a detriment to high speed travel if it contains undisciplined brats, pregnant women, incontinent geriatrics, shopaholics, any form of pets or even the best of mother in laws.

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11y ago
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Q: How many hours driving is 640 miles?
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