in this day and age, I don't even think having everyone fully employed at 40 hrs/week is reasonable. it's kind of silly with the giant upspikes in productivity and wealth since the industrial era that people are still by and large putting in at least 40 hour workweeks. it has nothing to do with people being lazy or whatever, there's just not that much work to be done when most of it can be automated or sped up by technology.
at some point I suspect we'll discard this notion of "everyone needs to work" as a social convention. it was essential at one point but not now.
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http://www.youtube.com/watch?v=npHDxSvwCE0