When I worked for General Dynamics I worked in the main assembly building for the F-16. It was a mile long. Just walking to my desk from the parking lot could be a good 1/4 mile walk. Bicycles and golf carts in the building were very common for people who had to move around quite a bit, but I guarantee there were a lot of people who walked miles every day as a normal part of their job. Think of it as an employee health & fitness benefit!