That’s a bit impossible to answer, you’re talking about all of space, in dimensions through the third and beyond, and we don’t even know how many total universes are in our own 3rd dimension.
Now if you’re referring to the alternate realities that make up the OVA, and it’s connected spin offs, we can get a fair view of that. But those are just alternate (living next door) dimensions all in the 3rd dimensional space.
