You seriously enjoy your work so much that you don't have anything you would rather be doing? Not even a side project? You must be working on the coolest thing ever.
The number of hours you volunteer to put into working for yourself is, frankly, completely irrelevant to the issue of hours demanded by a boss from their employees, who surely have things in their life they'd rather be doing with their time. Using the former as a way to argue that the latter should be kept high is an uncharitable mentality.
If you've run a business you'd know that the hours demanded by a boss are far less than those required to be successful as an enterprise owner. I've been in both worlds and it isn't easier because you own the business.
It's all work at the end of the day and it is not easy. It's hard but we get to choose the direction our life takes while weighing the costs, benefits and risks involved.
This is the crux of a state mandated shorter work week.
In Australia, the default is between 35 and 40 hours, 5 days a week.
Some people work more hours, some fewer. A proposal to change the standard wouldn't affect that arrangement.
People who enjoy working longer hours, say for a pursuit they enjoy or endorse, or like you to build up their own wealth at a much faster rate, likely wouldn't be affected by such a policy change.
I do hope you're not suggesting that your personal preferences should inform proposed policy changes like this?
This issues is about proletarian labor (rented by a capitalist in an employment relation) not petit bourgeois labor (applied to one’s own capital in an independent business.)
Servile and self-directed labor aren't the same thing.