If you've efficient you shouldn't try to keep up the same hours. That's just multiplying the work you're doing by your increase in efficiency. If you work 5x as fast as everyone else, but work the same hours, you're doing 5x as much work.

I'm suggesting to work more efficient as well as work less hours. Then you have more time to spend on relaxation and the things you want to do. That is how this modern society should view work, but we don't