Well, the speed at which you drive is going to have some influence on the answer.
Here are a few selected speeds, with the corresponding time for 639 miles. Note that
these calculations refer to driving time only, and to these you must add the time that
you consume during any stops, such as for food, fuel, pits, rest, etc.
1 mile per hour - 639 hours
3 miles/hour . . 213 hours
5 miles/hour . . 127.8 hours
10 mph . . . . . . 63.9 hours
15 mph . . . . . . 42.6 hours
20 mph . . . . . . 31.95 hours
30 mph . . . . . . 21.3 hours
55 mph . . . . . . 11.62 hours (rounded)
60 mph . . . . . . 10.65 hours
71 mph . . . . . . 9 hours
75 mph . . . . . . 8.52 hours
90 mph . . . . . . 7.1 hours
100 mph . . . . . 6.39 hours
213 mph . . . . . 3 hours
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