I work in a public school and therefore have a unique schedule.  First I deal
with 43 minute blocks of times for meetings.  I have worked around this by
scheduling recurrent free time for 43 minute periods.  

My other challenge is a four-day cycle in a 5-day week work.  I have
repeating classes on an A day, B day, C day, and D day.  How can I repeat a
class in the four-day cycle?

Thank you for any help.  Maryanne