Guess you used another colloquial expressionther Bill.  "spinning in circles"?  Kinda hard when spinning not to be going in circles.
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Anyway part time is defined as working less than 30 hours per week.  The archaic Standard Occupational Codes used to be used by 9th grade Social Studies teachers to educate kids about jobs, maybe that's where you heard about it, say 60 years ago?  Nobody really cares about them any more.
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As for teacher turnover, who cares?  Most local teachers have degrees in Hawaiian studies and a teaching certificate.  With those qualifications the kids are better off sitting in an empty classroom.  Without the "teacher" bloviating hot air about the Lost Kingdom the rooms will be 20 degrees cooler and won't need to air conditioned.