The bit about "metric time" (really decimal time, as Lisa might have observed; but that would be much less funny) is just a minor detail in the episode, but it's my favorite joke in it.
I hope you will get around to reading Plato's Republic eventually. I didn't cite the title because the political system that Plato promotes is not a republic at all (the translation doesn't correspond in meaning to the Greek title Politeia anyway) but rather a dictatorship.
It's my favorite joke too, (skinner has some excellent delivery and the line "80 past ten" has such great impact), but also I felt a good example of how people can mistake Utilitarianism with needless academic exercises/over-sciencing day-to-day things and the like. I will make a point of looking up this Plato work, thank you.