@tomgag i'm not quite sure but warhammer 40k universe is gone for a long time than right. Do we even have a scifi that got that far? Maybe worth considering like a catastrophe movie where people fear thier computers wont work after that date.
@m3tti Think Stephen Baxter's Xeelee Endurance is the only thing that comes close with at least one story set around four-something billion years into the future