Try telling that to my wife. Nurse Practitioner, taught biology as a lifestyle decision. Said it wasn't worth it and went back to nursing.
Teachers average roughly 1250-1400 hours at work.
Lets see, 90 days of school per semester plus one week before the classes begins and one week after classes end. That gives 5 + 90 + 90 + 5 = 190 days @ 8 hours per day = 1520 hours per year.
But maybe you'll be able to fool someone whose family didn't spend an aggregate of 40 years in the life...