So, I'll chime in on multiple facets of this:
First - This isn't going to happen. Why? Who's paying for it? Tax increases definitely won't go over too well right now, and quite obviously, more hours = more $$$$.
Second - We DEFINITELY don't need more time in school. This coming from a current High School senior, as it is right now, I'm literally leaving two hours early each day because I'm out of relevant classes to take. And, because of idiotic arts requirements, I even used to take a solid hour to two hours a day of pointless classes (introduction to theater production, etc). If you think american kids need more instruction in something, um...there's plenty of time in the current day to do it, get rid of some of the fluff crap.
Third - I would predict that most people would hate this idea, so....which congressmen would really vote for it?