Administrators are interested in personnel issues, in avoiding problems, and in maintaining an even keel. There just isn't time in their schedule to observe, train, re-tool, motivate, or inspire teachers. This is an unfortunate truth. Sadly, research and development are just not line items for our public schools. To assume that schedule restructuring could or would automatically result in better lesson plans is naive and foolish.
Longer periods encourage teachers to focus more closely on their subjects.
They are forced to adopt creative teaching techniques to avoid 90-minute lectures and the consequent loss of student concentration. Teachers have more time to fully develop concepts and imprint that knowledge on the students. The harsh truth is that students have a saturation point or attention span of about 45 minutes. Extensive research shows that they do not function well in long blocks of time. This is reflected by television programming, in which the most creative minds in the country have established an average show duration of 30 minutes.