That article has some really shady analysis in it.  An example:<p><i>Despite there being diminishing returns on my time beyond a certain point, there are still positive returns. To elaborate, if my first 10 working hours per day are worth $10 per hour to the investors, the 11th hour may be worth $9, the 12th hour $8 and so on. Still my 19th working hour would still be worth $1 to the investors. As long as I am not destructive and my work produces value, and I can function the next day back at the $10 an hour mark, there are real benefits to my company for me putting in my time.</i><p>He provides no proof for his claim that performance drops off in such a linear fashion and he can consistently work nineteen hour days while being just as productive the next day.