This research report on school schedules commissioned by a high-performing district includes a number the aspects of your school's fall plans: five-week modules, block schedules, rotating schedules. It does not include six-hour classes.
https://www.lwsd.org/uploaded/Websi...novative-Approaches-for-HS-Schedules.pdfThis report from the same consulting group describes the 4x4 (two terms, four courses each), 3x5 (three terms, five courses each) and 75/75/30 schedules:
https://www.mansfieldisd.org/upload...Research-OptimalScheduling_Secondary.pdfA high school in Massachusetts apparently used a plan (the Copernican plan) similar to your schools, referenced in this article:
http://www.ascd.org/publications/newsletters/education-update/mar93/vol35/num03/Are-Longer-Classes-Better%C2%A2.aspx
and described further in this ERIC citation:
https://eric.ed.gov/?id=ED313812The superintendent at that time (early 1990s) instituted a schedule of six-week modules, where one four-hour class was taught each day for 30 days, for a total of six courses per year. The district appears to be employing a slightly less dramatic version of block scheduling these days, but with some element remaining.
I don't have a citation for this one (although I expect I could find one), but my own school used to run a year-long cycle-based schedule that consisted of two weeks A cycle (four courses), and two weeks B cycle, alternating cycles.
And note that quite a few schools essentially used a schedule of one or two classes per day during remote learning. (My DC's school had synchronous class time for each class only once per cycle, which came to once every two weeks, with the remaining work asynchronous.)
