You can't express distance in terms of time. You need more information to figure this out. Here's why:

* Speed is needed: To convert distance into time, you need to know how fast something is traveling. For example:

* If you're walking at 3 miles per hour: 21.9 miles would take you approximately 7.3 hours (21.9 miles / 3 mph = 7.3 hours).

* If you're driving at 60 miles per hour: 21.9 miles would take you approximately 22 minutes (21.9 miles / 60 mph = 0.365 hours, then multiply by 60 to get minutes).

Please provide the speed, and I can help you calculate the time!