Why Do We Work Eight Hours Per Day?

"It's so interesting, because even for developers, where you don't have a strict schedule... people only feel efficient if they, at least, on average, have worked eight hours. So why do i also feel in my indy projects that i need to work eight hours a day? It makes no sense," he says. "Having him here kind of made me realize that it is possible to work lessnd and some of thetimes you are still productive."