Terry, I can attest to at least one teacher who works way more than 10 extra hours per week, my wife. Being an elementary school librarian, however, may exacerbate that. In addition to staying at school until 6 p.m. most nights, she spends time on weekends doing the administrative stuff that libraries require. As for all the other teachers, all I know is that when she’s at her school hers is usually the only car in the lot.