I was thinking as a student, is there some sort of thought that goes into have 2.5 hour lectures twice a week? I am thinking that this is not the best layout for learning, and was wondering if this has been studied by anyone to see what lecture times maximize student learning. For me, in a 2.5 hour lecture, I honestly can keep myself awake for maybe 20-30 minutes before I begin to doze off. If the lecture becomes very conceptually or mathematically intense, I fall in and out of consciousness, simply because I don't understand the concept being taught, and it's hard to keep awake when you are so lost your professor might as well be speaking another language. Has this been looked at from a pedagogical perspective, or is it just something that the schools do for the sake of convenience and scheduling? Whatever happened to the days of meeting 5 days a week for 1 hour like in K-12?