Work Less, earn less?Watch
To have a job which is 20 hours a week, you need no qualifications and the work is neither physically or mentally demanding. You recieve very little money and lot's of free time to spend that little amount you earn.
Or to have a job which is highley demanding either physically, mentally or both. You have to work at least 40 hours per week and earn a very high salary with less free time to spend the mony. You need qualifications to a very high standard.
The latter, and early retirement