Class time vs homework?<p>For me, in 10th grade plane geometry, I did REALLY well -- loved the subject, hated the teacher (with some reason). Sooo, I learned the subject 90+% from "homework"! For each lesson, glanced at the text and then started on the exercises. Started with the hardest ones and worked until they became too easy. Then solved all the harder supplementary exercises in the back of the book!<p>Net, on the state achievement test, came in second in the class of ~30.<p>One day, great fun: One of the exercises in the back of the book was harder than usual, and I started on it on Friday and didn't get it until Sunday evening. In class on Monday, the teacher had the class work on an easy exercise but with the same figure as the hard one. So, for the only time, I spoke up in class:<p>"There's another exercise in the back with the same figure."<p>The teacher took the bait and had the class start on the harder one. ~20 minutes later no one had any progress, and the teacher was exhorting the class<p>"Class! Think of the given, class!"<p>Not wanting to disrupt the class, I said:<p>"Why don't we ..."<p>and the teacher interrupted and shouted:<p>"You knew how to do it all the time."<p>Yup, wouldn't have said anything otherwise!<p>In advanced courses, most of the learning was from study outside of class.<p>For the Ph.D. qualifying exams, led the class in 4 of the 5 exams, and nearly all the background learning was what I did out of class.<p>E.g., although took a lot of math courses, none covered Stokes theorem and had to do that on my own, from Buck, Apostol, Fleming, etc.<p>Beyond such courses and for Ph.D. research, challenging problems outside of school, ... there are few if any classes. For a lot of the learning for computing, there are no classes.<p>But for the claims of the OP here, sure, maybe only 4 days a week of school and shorter days in school, especially if the kids can make good use of the extra time out of class.