Have you watched the video tours?Given Musk's reputation I find it hard to believe that anyone would get away with putting out an average level of work.
This has been covered before but it bears repeating. Musk operates on the "demand 150%" and get a much better product than if you demanded 100%. This leads to lateness but the final product is better and probably done in less time than it would have taken to get to that level at 100%.
I don't know if he could operate any other way.