Sounds interesting, but really hate the 'person <time>' metric, because it basically falls apart as the number of people grow. If one hires a million people to

Sounds interesting, but really hate the 'person <time>' metric, because it basically falls apart as the number of people grow. If one hires a million people to build something, and it takes a month, did that take 80000 people years? In reality, most folks are off doing other things, waiting on someone else, or as in my example, probably doing nothing at all...