20:74:04:06Classroom hour.
Section · Administrative Rules of South Dakota · View on sdlegislature.gov ↗
A classroom hour is a period of at least 50 minutes of actual classroom instruction. Additional study assignments are not counted as hours of classroom instruction.
Source: 27 SDR 7, effective January 1, 2001; 28 SDR 28, effective September 2, 2001.