It depends on the speed at which you drive. That, in turn will depend on your vehicle, the road conditions and traffic, the weather, speed limits and whether you obey them. Also, you will have to add time for stoppages for rest (it is not safe to drive for long without a break), filling up, food or toilet stops etc.
17 hours, 20 minutes.
21 hours 40 minutes.
1300 mi / 85 mph = 15.29 hr = 15 hr 17.6 min
14 hr 27 min.
About 17 hours 20 minutes.
16.25 hours exactly - assuming a constant speed.
Time = Distance/Speed = 1300 miles/55 mph = 23.64 hours = 23 hours 38 minutes (approx).
1300 miles divided by 80 miles per hour (1300/80) = 16.25
17 hours, 20 minutes at 75 mph
About 18 hours 34 minutes.
The overall distance is about 1300 miles. The estimate time it will take is about 19 hours and 25 minutes.
If you could drive non-stop at a constant speed of 65 mph, it would take about 20 hours.