My older son had one teacher who would start the class by telling the students what chapters in the book to read during the class period. The teacher would then go to the teacher's lounge or outside if the weather was good and relax and smoke until the class was over. In middle school my younger son had a physical education teacher who gave the students tests of physical condition, devised a series of exercises to improve their condition and then periodically retested them for improvement. In high school it seems that they go to the gym in physical education class and then either play basketball or sit on the benches at their option until the class is over. Sometimes other classes are spent watching current popular videos, having pizza parties, watching baseball and basketball tournaments on TV and in one case they spent a few days assembling parent information packets for the office staff.
Classes sometimes have to be missed for PEP rallies for the basketball team.
It is interesting that although most of the teachers are female and so are most of the best ones, all the promotions to administrative positions are males. It is also interesting that no bus drivers or janitors are female, but, I think, all cooks are female. I was told that the system tried a female bus driver once only to find that females could not do the job. The school system has never planned a teaching position needed and tried to recruit the best possible teacher for that position. They have simply picked the best teacher for any open positions from the pool available from existing teachers or applicants who live in the county.