I worked 10-15 hours a week (and somewhat more in the Summer) for about three years of college and can confirm, still the most free time and lowest stress ever. Worst, by a mile, was high school, and I even had a pretty good experience there. Far worse than working a full time job while having multiple young kids, even. Worse than before we had kids but when we made very little money and struggled to pay the bills every month. High school is terrible.