People work 40 hours a week, but as technology advances and better systems or robots replace labor, a 15-hour workweek will be needed. However, I don't think that this should reduce people's income. That way, people will have a better life because they can spend the rest of their free time on hobbies and personal development. However, the effectiveness of the 15-hour workweek can vary depending on the job. A profession that produces results by creating or thinking for a long time, for example, a painter, a composer, a sportsman, or a scientist, will not have as much success as before by only working 15 hours a week.