This all depends on whether or not the 2 hours you're losing everyday with your hypothetical kids is sufficiently nullified by the (marginal)savings. Your kid's

This all depends on whether or not the 2 hours you're losing everyday with your hypothetical kids is sufficiently nullified by the (marginal)savings. Your kid's grade school academic performance is more important than effectively a full extra work week worth of availability for the family? Doesn't sound so virtuous.