Nobody knows for sure, but it seems to be somehow tied to the number of fundamental types in programming languages. And there is wispy evidence that the universe is written in JavaScript.
It all makes sense. The universe progressing toward heat death is a memory leak, and it causes a reboot every 10^10^10^56 years. Unfortunately there is no non-volatile memory.
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
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.
