I am lucky enough to only work part time, four days a week. But I find that having to schedule my free time makes me more productive. I didn't seem to get as much done when I wasn't working, I think it is cause I didn't value my free time as much. But I have not been away from a job of some sort for more than a couple of months, and those were for medical issues. I used to work three part time jobs for a total of about 65 hours a week and made much better use of my time. I think the less I have to do, the less I want to do.