Doing some more order of magnitude approximations, in order to scale this black hole down so it were the size of our observable universe, define "the diameter o

Doing some more order of magnitude approximations, in order to scale this black hole down so it were the size of our observable universe, define "the diameter of the universe in millimeters" (approx 10^30) as mmU. There are mmU * mmU * mmU * 0.5 mmU universes in the diameter of this black hole. For each millimeter in this scaled-down black hole, there are mmU groups of mmU universes, with another half layer of nesting, but then you can divide that by 1000. To fit the number of universes in the whole volume in a line end to end, repeat this process again, except without the extra half layer and division by 1000.