[ghaff]

Many moons ago when I was doing a combination of engineering and project management, I had to come up with a schedule for a shipyard project. Which I dutifully did. It was probably two months or something like that.

Ran it up the flagpole. It got cut in half. Fortunately I didn't need to change the schedule I had drawn up. I just said each box is now half a day. (This was before we used computers for this sort of thing.) As I recall, the job came in very close to my initial estimate.