The only series able to successfully consume up to 60+ hours of my life on eah installment (I think TA had the most, with over 100 hours... that's over 6 full days of my life wasted on some kid's fantasy world). Seriously, there's just so much to do (side quests, main quests, hidden characters, mini-games, hidden scenes, plus power-leveling to 99 [which I've only done in FFI DoS, but still])

The great storyline, characters that I can actually care about (maybe not as much as MGS characters, but still) phenominal music, and gorgeous landscapes and towns.