Are you sure you know how long a mile is?<p>At an average walking speed of 2.8mph, that&#x27;s 4.6 hours of walking.  The average American adult walks around 2.5 miles per day, mostly indoors trips between rooms.  The American knowledge-worker or automobile-dependent suburbanite will tend to have a lower average.<p>Jogging &#x2F; long-distance-running tends to be about twice that fast, or 2.3 hours of activity.  Per day. Ten percent of their lives, running.  Most people don&#x27;t come anywhere close.