took you the longest time to beat (hours) and the shortest time to beat?

Impossible to answer --- they're all beatable in varying lengths of time and all have been in varying lengths of time. Technically though, FFX-2 is the one that can be beat the quickest, dialogue and scene-skipping on a New Game Plus playthrough, I can polish that one off in less than two hours.

None take longer to beat than XI, though.

well, it's not a Final Fantasy Game, but Star Ocean was the longest and Dragon Warrior (enix) and FF x-2 are the shortest.

I have never played Star Ocean but I do have roughly 1,200 hours on FFX.

based on amount of program hours...i'd say you'd break that record with Star Ocean...it wasn't that bad of a game...i liked it.