If you mean that travelling at 26.6 miles per hour, how long you would travel in 4 hours, you would travel 106.4 miles in 4 hours.
It depends on the speed at which you travel.
330 miles
It would not take an hour to travel four miles by plane.. It would be mere minutes
20.4 hours
5 hours 10 minutes.
If you travel at 60 mph, it would take 2 and a half hours. If you travel at 65 mph, it would take 2 hours and 18 minutes.
That would take 9 hours and 42 minutes.
You cannot convert hours to miles. Hours is a measure of time, miles is a measure of distance. If you want to know how many hours it would take to travel 577 miles, you would need to specify what rate of speed you were traveling at.
Approx 4 hours 42 minutes.
There are no "hours" in any distance. If the question is really "How long would it take to travel 721 miles?" then the answer depends on the average speed, which depends on the mode of travel.
Inconsistent units, cannot be converted. If you wanted to know how many hours it would take to travel 321.95 miles, that depends on your speed.