Less than an hour according to that article:Are the days longer?
"Current start time is 8:15am but that will change to 8:00am. The end of the school day will extend an additional thirty minutes, ending at 3:45pm. Compared to the school day two years ago at Murray, it’s just 15 minutes more than they were doing then.
Under state law, Iowa school districts are required to provide either 180 days or 1,080 hours of instruction to students. This new schedule will put student hours at 1109.25."