This particular issue is one that we have all faced at one time or another, a higher up wants a project completed and they want it now, regardless. As a freelancer you have quite a bit of control over this situation, as the higher up is your client, and you dictate to them the amount of time it’ll take for you to finish their project. Typically, I work out my estimate, then double that.
As an employee however, you have little or no say over things like this. I know this first hand, as this is something that I have encountered quite recently.