I'm not an expert, but it seems to me that if the labor isn't alienated, then it becomes less about the hours and more about what's accomplished.

No need to be an expert.

When I'm working on a project that is mine and has my name on it, and I think that it'll help me or someone else in a meaningful way, I'll happily lose sleep over perfecting it.

When I'm just a cog in a giant faceless machine that wants only to maximize profits, I don't really care what the hell happens with the product as long as I get paid.