I think it depends on the individual’s inner motives, goals, incentives, etc. Yes, Americans typically work more hours than most other countries sure. I personally work a bit more than 40hrs but that’s to minimize the workload for the next week or to open room for more priorities. Peer pressure could be likely especially if that’s the expectation of a company or the culture there. Overworking can lead to demotivation depending on the individual’s motives. If the person is a workaholic then I’m sure that it won’t matter. However, the opposite can be said about a non-workaholic who may become depressed.