We also need to remember that just because kids are at school for more time doesn't mean that the kids are getting more teaching time. When you count time between classes, kid disruptions, teacher dealing with individual kids, lunch, P.E., etc. it is amazing how much unproductive time exists. If you add teachers putting in filler time, frequently less than half of the time is actually productive learning time. If you take out the time wasted on P.C. garbage, it is even worse.