For college students, certainly. A full course load at college has 15 classroom hours a week, and you're expected to do much of the work outside class. Heck, going by the 2-hours-out-for-each-hour-in, a college student "ought" to have 30 hours a week of out-of-class work, and full-time college comes out to 45 hours of time per week. Note that the high end of actual work in college appears to have been about 15 hours of class and 15 hours of homework / studying, so only 30 hours a week of total time.
High school kids have 6 hours a day / 30 hours a week of in-class work, and an extra 19 hours a week of homework / studying takes them up to 49. I can't come up with any logic whereby high school ought to be a 46% heavier workload than college, or whereby 14-18yos ought to be more capable of handling that workload than 18-22yos.
