I've seen the inverse of this, though. For example, I estimated it would take me a couple days to do finish one part of a project, but I told the PM one week.

I've seen the inverse of this, though. For example, I estimated it would take me a couple days to do finish one part of a project, but I told the PM one week. She in turn multiplied it by 3 when she actually turned in the project schedule. So at the end I was given 3 weeks for an estimated 2 day task.