SaraB: You have an affliction known as "strong work ethic." Many, many millions also suffer from it through unpaid overtime; it's considered in some circles to be heredity and in others to be learned as a survival technique.
Unfortunately, one malady does not fit all, for non-teachers don't have evenings, weekends, extended holidays or even made-up holidays off -- not to mention "in-service" set-asides for routine job duties -- to go with generous down time (two weeks at Christmas? spring break?) to help them cope while their union snuggles with their lawmakers.
Even those lucky non-teachers with four weeks' vacation and seven paid holidays off have to put in 233 days of at least 8 hours each, or a third more time than your FT minimum. A 20-year teacher in 4J and nothing more than a bachelor's degree made $60K this year.
Class dismissed.