rezenclowd3
macrumors 65816
No average game length of an action/adventure title is 8-12 hours.
A number of games can be breezed through a lot quicker. Resident Evil 5 can be finished in little over 6 hours.
RPG's tend to be the daddies of game length, some clocking in 60+ hours. However if you were to take out the backtracking, rambling text/conversations & random level grinding battles that length would probably end up around the same 12 hour mark.
I think you breeze through games then. RE5 took me MUCH longer, and generally don't have a hard time playing games. Then again I do try to complete games, not just beat the story, and I also play on the hardest difficulty. If one wants to be babied, I can see "beating" (story only) most games on easy or medium in a shorter time period.