The numbers are averaged across a whole year. So for example if you worked 40 hours per week in the summer, but not at all during the school year, it would average out to 10 hours per week. The same goes for ECs.
If you’re going to school, say 8-3:30, where do you get the hours to work 3+ hours per day (7 days a week), do ECs 3+ hours a day (7 days a week), and still have time to eat, drive anywhere and study?
I’m simply curious because 21+ in both categories is something I’ve never run across.