We have the teaching from the Holy Scriptures which describes the time we spend out of incarnation as one thousand years*:
Before mountains were brought forth,
And Thou dost form the earth and the world,
Even from age unto age Thou [art] God.
Thou turnest man unto a bruised thing,
And sayest, Turn back, ye sons of men.
For a thousand years in Thine eyes [are] as yesterday,
For it passeth on, yea, a watch by night.
Thou hast inundated them, they are asleep,
In the morning as grass he changeth.
In the morning it flourisheth, and hath changed,
At evening it is cut down, and hath withered.
* A period of time indicated by Rudolf Steiner.