Yeah length is really dependant on your style of play. I myself like to level characters a bit, and get a lot of stuff, but I try not to do EVERYTHING first time. FF7 took me about 60 hours to complete the first time I think. I played it again, but I kept my original file, and have built that into my ultimate file.... i\'ve easily racked up more than 300 hours on that baby since 1997....
I\'d say FFX will be quite long... they\'d want to make it a big outing being their first PS2 FF.... but really, TOO long just isn\'t a good thing. It\'s not a bad thing, but if FFX had say, between 50 and 100 hours or raw gameplay (yeah.. I know 100 is shooting high), it\'d take me between 100-200 hours to finish, and I really don\'t have that amount of time, that is to say it\'d take me MONTHS and MONTHS to finish..... and it gets irritating when I had study to do for uni, but I still have work to do on a game, takes my attention away.
ah well, let\'s just say I\'ll be happy with it so long as it\'s more than 30 hours raw gameplay... I\'m pretty sure Square is intelligent enough to provide that