FFI - Not played yet.
FFII - See FFI.
FFIII - See FFII.
FFIV - Beaten once, maybe the DS remake, once I get a DS, that is.
FFV - Every 2-3 years, probably.
FFVI - See FFV.
FFVII - Every 1-2 years.
FFVIII - Beaten it once and started some weeks ago again. However, my PSP is bricked for the time being.
FFIX - Every year.. If there's time
FFX - Not that often, like three times so far, but the point is I'm playing on my old states over and over again. There are SO many challanges in this game, it's intriguing at this point.
FFXII - See FFIII.