1: the last minute, or leaving just enough time to finish the task at hand, sometimes not enough time.
2: doomsday, the end of the world, right before the globe is annihilated, and you dont have enough time to make good on everything you promised or messed up on.
1: geez, i waited till the eleventh hour to do that paper, now im sure it's an F
2: im all set and ready for the eleventh hour, cuz i made good for everything i ever did
At the last minute or with not much time left
In the eleventh hour of my life i realized i had wasted it.