Time would be a currency if had inherent value, and furthermore, if that value was normalized for all people.

Time has value, but the value isn't inherent to it, it how you use the time. And that value is relative to the individual, can't be traded between peers, sold or bought.

Time is probably a concept as far from currency as I could ever imagine.

(I once read that Focus is more valuable than time, btw. It's also not a currency, but it has much more value)