Assuming a constant average speed of 75 miles per hour over this distance, dividing distance travelled by speed gives 647/75 = 8.626 recurring (that is, 8.626666...) hours or 8 hours 37.6 minutes.
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It will take 20 min to go 20 miles at 60 mph.
At 70.06 mph, it will take an hour.
About 18 minutes at a constant 500 mph.
9 hours 42 minutes to travel 565 miles at 60 mph
450 mi / 30 MPH = 15 hours