I haven't tried a regular speed run on the game yet, without the other restrictions of the challenge, but I was assuming that by leveling efficiently and skipping cut-scenes, the play time of ff12 could be cut from 50 hours down to about 15 hours with no other restrictions imposed, just like ff7-10. FF7 is probably the longest ff, and that game can be speed run in less than 12 hours. So I think it should easily be possible to clear FF12 in 20. The challenge would lie in powering up efficiently enough to be able to win the boss battles, when playing in such a hurried manner. The more I think about it, the more I think it's doable. Maybe I'll try it.