This cannot be answered properly without knowing how fast you are traveling.
There are 721 kilometers from Barcelona to Toledo, and it takes almost 7 hours to drive.
speed = distance/time therefore time = distance/speed 721/65 = 11.09 hours, so roughly 11 hours 6 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.
721 miles
It is 721 square miles.
It is 721 miles according to Google Maps.
Detroit to Michigan is roughly 721 miles.
721 miles
721 miles
52 kilometers
448 MI/ 721 KM