Laws of Productivity
If you think crunch times are a great idea, and working 12+ hour days plus weekends is commendable, then you might be interested in what corporations and scientific studies have reported on the subject.
For instance, the Ford Corporation found that productivity boosted slightly for workers who worked 60 hour work weeks, but after the 4th week showed significant decreases in productivity. In addition, working more than 40 hours per week leads to loss of creativity and bad design decisions. One interesting finding is how workers who work more than 40 hours per week perceive themselves as accomplishing more than they actually are.
Jason Fried of 37Signals writes in Rework, "Our culture celebrates the idea of the workaholic. We hear about people burning the midnight oil. They pull all-nighters and sleep at the office. It's considered a badge of honor to kill yourself over a project. No amount of work is too much work.
Not only is workaholism unnecessary, it's stupid. Working more doesn't mean you care more or get more done. It just means you work more."