I recently read that within a few seconds of the Big Bang the universe was already 20 or 30 light years across. And in that hyper-expansion, it carried all the objects embedded in it along for the ride. Those ojects were not moving through space faster than light. They were moving with space. And Einstein has nothing to say about how fast space can expand.
That changes everything in your calculations, and mine. Apparently (I don't claim to understand it), because of this hyper-expansion of space, the universe itself may be much larger than 26 billion light years across.
Hundreds of billions? Maybe. Infinitely large? I've even read that, though I don't see how that's possible!
I don't see how it could NOT be infinitely large. If it's not infinitely large, then it has a shape, which begs the question, "What's outside that shape?" Of course, most of it may be devoid of stars.