duration

You alone know the duration of the generations, And you reveal not Your mysteries to many.

For as you did see a great cloud which ascended from the sea, and went and covered the earth, this is the duration of the world (= αιων) which the Mighty One made when he took counsel to make the world.

And it came to pass when the word had gone forth from His presence, that the duration of the world had come into being in a small degree, and was established according to the multitude of the intelligence of Him who sent it.