Possibly even chain multiple such games, like CK2 to EU4 to Vic2 to HoI4.
Paradox Grand Strategy games cover very long time, and most people never even 'finish' a single game of CK2, or EU4 - but it's possible to go the other extreme and play a 'megacampaign' - start in one game, then convert to another, and keep playing. There's very little information about this wonderful thing, so after doing some research I decided to write it all up.
