Time is Money

Ok, so who was the idiot who said time was money? Because I'd like to have a nice chat with him. Or her. Or it. Time was never money. I suppose you can say money was time, but that's hardly an accurate metaphor either.
I mean, it's not like there's a person you can go to and say "Hey, I'd like to buy back that hour when I did my homework that day and redo it, because I got a 20% on that assignment..." You can only pay for the time you spend with another, and that's only for some occupations. Sure, time wasted is costly, but the cost goes beyond monetary value, because you're never gonna get that time back. A single millisecond could be crucial.
If a nuclear bomb was miscalculated by a second, it might go into the sea instead of on land, if it were to attack an island. A split second movement could make a bullet go into a nonvital part of someone's body. But it's not like, if you miss that second, you can just by it back with say, $50.
It would be very nice if you could buy back time, but it would also kinda suck because no one will ever learn from their mistakes. Also, criminals can never get caught, because all they'd have to do is buy back some time. For time to be a tradeable thing would probably be one of the most dangerous things in the world, because you can right all your mistakes, but not everyone will have good motives for doing so. So there's some food for thought for you.