The first thing to note about the proposed restructuring of the
class schedule from 5 periods of 50 min to 3 periods of 75 min is that
the net result is a 10 percent reduction in contact time. The
second thing to note is that the change goes against the observation
that attention spans have a fintie length. It is hard to keep the
same intensity during a 75 min period as during a 50 min period.