A 'thousand' means much, many, a countless number, a whole era of time, an abundance. When used in reference to the Lord, it actually means a number greater than that: In those cases it means what is infinite, what is truly without end.

421. WHAT THE WORLD OF SPIRITS IS.

The world of spirits is not heaven, nor is it hell, but it is the intermediate place or state between the two; for it is the place that man first enters after death; and from which after a suitable time he is either raised up into heaven or cast down into hell in accord with his life in the world.