:^/ I haven't played Rogue Galaxy, except for the demo disk, and so cannot say how long it lasts. However, Dark Cloud and its sequel will allow one to revisit earlier dungeons and so on to build up one's weapons and other goodies as much as one wants. There are side missions/diversion such as virtual fishing, spheda (a
golf-like sport), medals for completing dungeons under particular
circumstances, and so on. It's almost endless.
;^) I've logged over three hundred hours of playing time on each, though not nearly that much time was actually necessary. It's just that their charming digital world has so much appeal that I don't like to leave it....