Also from the second link: This research also demonstrates that teachers need effective classroom management strategies in order to maximize their instructiona

Also from the second link: This research also demonstrates that teachers need effective classroom management strategies in order to maximize their instructional time and minimize disruptions. However, it is important to note that, as researchers from LSS concluded in a study titled Extended School Day/Year Programs: A Research Synthesis, little research evidence exists to suggest that increasing the school day or school year will increase student achievement. Rather, "the crucial issue seems to be how the time is used, with quality of instruction being the key. ...which is basically the author's point, and it's the truth in my experience. Saying that you should try to amass a huge number of hours learning is a bit like measuring programmer productivity by SLOC: bigger numbers aren't necessarily better. A smaller number of quality hours are much better than a huge number of low-quality hours. Now certainly, I don't deny that more quality hours are better than fewer quality hours. The problem is that it's very difficult to achieve a high number of quality hours. The human body is only capable of so much.