That depends on how fast you are traveling, if you are traveling at 50 mph, then it would take 1 hour 30 minutes.
665/75= 8.87 hours
585/75 = 7.8 hours
Four hours.
440/75=5.86667 hours
450 miles.
2.6 hours.
Eight hours.
12 hours
180 miles divided by 75 miles per hour = 2.40 hours or 2 hours and 24 minutes
4 hours.
8 hours.
At least eight hours.