Eliminate the last 15 minutes of class.

Fifteen minutes of a 45-minute class is wasted wrapping up and leaving. Fifteen minutes of an 80-minute class is wasted wrapping up and leaving. Fifteen minutes of a 50-minute class is wasted wrapping up and leaving. If I have a 60-minute class, that last 15 minutes of it is wasted, so I leave at 45 minutes.<br><br>Why not just eliminate it?