3 courses and 16 hours of work a week?

I know the program advises that one should work no more than 10 hours a week doing 3 courses at a time, but does anyone do around 16 hours of work without feeling completely stressed out? My current job wants me to stay on for 16 hours a week rather than quitting outright to focus on school this year.

Replies from mommies and daddies will be super valuable.