Ok, well A.) It was clearly a joke. B.) That number was based off the Wikipedia heat death of the universe page reference for this: https://arxiv.org/abs/hep-t

Ok, well A.) It was clearly a joke. B.) That number was based off the Wikipedia heat death of the universe page reference for this: https://arxiv.org/abs/hep-th/0410270 https://arxiv.org/abs/hep-th/0410270 C.) Regardless of the correct amount of time, no one will be there to verify it. We don't even understand enough yet to say with absolute confidence that heat death is the definitive final outcome of the universe. But thanks for the reply :)