The thing is, they've done research, and ... it turns out that human beings are capable of about six hours of concentrated work in a day on average on a regular basis. Or, at least, six hours of productive work at their greatest efficiency (whatever that happens to be for their job). It may not be all in one chunk, mind, but that's about the average. So for anybody working an 8-hour shift, yeah, at least two hours of it is going to be faffing around. (That may not be two hours of faffing around all at one time, but rather broken into chunks of ten minutes here and there, mind.) When you reduce the workday to six hours (as the Scandinavians have done) you lose absolutely nothing in productivity.
(Yes, in a do-or-die situation, humans can work longer! ... but then we burn out quickly, it's not sustainable, especially for anyone older than about 30.)
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(Yes, in a do-or-die situation, humans can work longer! ... but then we burn out quickly, it's not sustainable, especially for anyone older than about 30.)