The entire point of school is for learning and this argument is based of the idea of wether kids are learning due to long schools times. It might be more effective if the schools worked at about 4-5 hours tops along the times of 9:00 Am - 1:00 Pm. The kids would not only have more sleep and be more efficient in their studies, but also allow the teachers to have enough time to get all the information out properly.
You spend your whole morning and afternoon and 2-3 hours at school. Everyday you have school. It actually it isn't fair why can't we just have 60 minutes every class or less for 4 classes. They wonder why students come to school all tired and bored. Students should have longer weekends like 3 day weekends.
Teachers (at least at my school) need to teach one or multiple lessons in one period which is an hour and thirty minutes, and teachers need to cover all of the subject for students to pass exams in a certain about of months. If we were to shorten the time, it would take a very long time to graduate school, it would cause more days of school and less breaks. I find my hours reasonable, I take four classes for an hour and thirty minutes and a forty-five minute lunch for a high school. Life isn't fair, people should know this and get over it.