It takes a long time but when you have nothing less to do in the game it kind of makes sense. I do strongly urge people to do a low level challenge and get Cactaurs level up + abilities along with Bahamuts 4x ability thing. That way you can load up on strength, magic, vitality, and spirit level up bonus. HP is the least of your worries as the HP up 10 items are cheapest. On my last playthrough I only got Irvines and Rinoa's stats maxed. All my other characters were great but those two had 255 all around.