Earlier quoted context omitted.
So make it illegal to work for more than 6 hours? What if I actually want to work more and agree with a company to do so and get paid for it?
Whatever rules exist at the moment, just decrease the time by 25%. Not sure exactly how to make such a change though, probably hard, just suggesting a solution like was asked for
Might I gently point out that the difficulty of the problem is all political. The easiest "solution" is of course to take all the wealth that exists in the world and fairly distribute it while keeping everyone working as effectively as they are now.
Now obviously that idea isn't anywhere near being a solution. Neither is your idea.