[Fierce Allegiance]

You are definitely more precise, not necessarily more accurate.

I work in construction. If you want to build a bridge that takes 6 weeks with 10 men, you can't necessarily build it in 3 weeks with 20 men.

[Moral Hazard]

I'm quite familiar with the concept of diminishing returns, but the original quastion did not include an real-world factors that might affect the time.

[Our man in washington]

I work in software development. We have a saying that "you can't hire nine women to make a baby in a month."