Till next word...
*A article from 2007 detailing from places like the Center for work life policy on how people at the top can work up to 70hrs a week and how most describe 16 out of 45hrs a week working as 'unproductive'.
*A personal post by someone who works 45-55hrs a week on how much of his life is spent working.
*A simple calculation on simple 8hrs a day working calender for a lifetime.