I will remind that Brahman is not only the existence, it is infinite and conscious too.
There is no place or or no time it is not and and there is no break in its consciousness. All three conditions have to be met. And it is to be realised in self. That is a tall order.
I really don't see that as such a tall order. But then, I'm accustomed to viewing cosmology from the viewpoint of spacetime: all of space and all of time. When you say there is no place or time where it is not, that simply means it is limited to where there is space and time: our spacetime manifold. Now, whether spacetime (the cosmos) can reasonably be said to be conscious is my only dispute.
We the ego-selves become waking body, dreaming body, and sleeping ‘no body’. Self-Brahman is that which does not slumber and does not change but is the essence of knowing of these three states. As per Upanishads that is to be known.
A common metaphor used is that of a cinema screen and pictures playing on it. Brahman, the true You, is that screen that is truth-consciousness-infinite. In Brahman there is no world. Brahman never becomes anything.
Very familiar with the imagery. I've even experienced it myself. I just don't think it is valid. It is just one more illusion. At least, as far as I can see.
/E: I'm also very accustomed to dealing with infinite quantities. I just don't find them that amazing any longer.