Its a while since i bought a DS game but that one did tempt me i have to admit, so by the sounds of it you would recommend buying it, i think ill give it a go so it better be good lol.

Demon Cleaner:

I by no means meant to imply that rpg's are too long i love a game that takes 25-40 hrs to complete its just the laborious tasks some of them will have you go through to get to the end, of course this isnt just limited to rpg's it could be any game, maybe i just havent played the right ones and i suppose if im honest i havent played as many rpg's as i have other types of game.