There are actual save converters that work "upwards" (time-wise) across their range of games? Amazing. Sounds like an awful amount of hours to go from 769 to 1948, though.
And yeah, it's gotta take a long time to go from 769 to 1948, but can you imagine doing that, then being able to look back at your 1100-year history and see how far you came, from a tiny barony to a modern power, fighting tooth-and-nail the entire time for survival?
Personal restrictions such as preventing yourself from 'gaming' the game helps a more balanced mega campaign.