As a matter of interest I just measured the distance I used to cycle on my last real job inside the wire going from my office to one of my outstations - 5.5 miles round trip.
Best will in the world, that was 20-25 minutes out of my day. Two trips and you were looking at an hour.
Turn that round, shag on sqn goes to SHQ and back - 6 mile round trip - that is an awful lot of manhours.