Future pensions are completely relevant. A person earning $60k/year needs to save at least $10k of that for retirement. A teacher earning $45k/year does not. Besides, if a teacher really feels cash strapped, he or she has 2-3 months in which to earn more money.
For every teacher working 70 hours/week, there must be 7.75 teachers working only 35 hours/week (or 15.5 teachers working 37 hours/week, or some similar combination). To see this, observe that the BLS data I cited is capped below at 35 [1] and do some basic arithmetic. So at best, for every teacher working 70 hours/week, there are 7.75 teachers working 35 hour weeks.
For every teacher working 70 hours/week, there must be 7.75 teachers working only 35 hours/week (or 15.5 teachers working 37 hours/week, or some similar combination). To see this, observe that the BLS data I cited is capped below at 35 [1] and do some basic arithmetic. So at best, for every teacher working 70 hours/week, there are 7.75 teachers working 35 hour weeks.