This may work among programmers, software developers, etc. But in other more structured environments [management consulting, public accounting, I-banking, etc]

This may work among programmers, software developers, etc. But in other more structured environments [management consulting, public accounting, I-banking, etc] a 40 hour work week will almost never be the norm. Sure, more resources could be added to the project, but the budget doesn't support that, so... you're hosed.