8 hours is surprising. i guess you must have flew right through the main quest and not did any other missions.
i completed it in about 14 hours and did most, if not all, of the missions that i could find.
cool game tho. some intense battles in there.
it might have been 9-10 hours possibly, i did most of the side missions but didn't do the card games and only a handful of the races, I think I was just expecting something more sandbox and less linear, should have rented instead of buying