How long would it take to walk 10 mile?

The amount of time it would take to walk 10 miles will depend on the speed. On average, most people walk at a speed of 3 mph so it would take about three and half hours to walk for the 10 miles.
It just depends: How fit you are, how fast you're walking, and where are you walking (uphill, downhill, etc.)
On average, women walk at 3 miles per hour. At this speed, it would take 3 hours and 20 minutes minutes to walk 10 miles.

On average, men walk at 3.5 miles per hour. At this speed, it would take 2 hours and 51 and a half minutes to walk 10 miles.