One thing that springs to mind here.
When I was an Apprentice Electrician, I was asked to measure the run from the pole, down a long driveway, under a cattle-stop and across the driveway.
This was "on the way past" on the way to another job.
All well and good, I aced that one, or so I thought.
I'd left out the length that ran up the pole.
It was 18ft too short and with a cut-to-length service from the suppliers 100km away.......
Boy did I get a roasting about that. [Linked Image]