I once read someone give similar advice about estimation. What stuck with me most is that if someone pressures you to change an estimate, it's no longer an estimate. Most managers don't actually want estimates.
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.
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.