I've had plenty that I've run up about 50-60 hours on in the past, but to beat just the story, I'll go with FFXII. I still haven't had the time to beat it, but I'd estimate I'm a good 10-20 hours from beating it and I've already run the clock up over 45 hours I think at last play session. This is the only RPG except for FFT that I haven't beaten in 35 hours or less on the first playthrough.