We have the teaching from the Holy Scriptures which describes the time we spend out of incarnation as one thousand years*:
At evening it is cut down, and hath withered.
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,
* A period of time indicated by Rudolf Steiner.