That'd be cool, actually.
Could have 'average' 'manufacturers average' and 'minimum'. ;)
(Like... Morrowind has how many hours of gamplay in it... but it's actually possible to finish it in something stupid like 7 minutes...)
Yeah, it's amusing how some games more than likely take longer to install than to do a speedrun through them... (I haven't played Stalker yet, but a 17-min speedrun isn't what I was expecting... Then again, a speedrun of Quake almost takes you back in time...)
The value of a game can certainly make gametime seem longer, though. I personally really liked Prey. I have only played through it twice, though, in separate sessions a complete year apart. Thing is, apparently I liked the game so much that in the second play-through (a complete year later), NOTHING was new... I was expecting each area, and knew immediately what to do...
Thing I found most interesting was that the game seemed extra long to me... But, according to my gamesaves, my first time took 7.5 hours, and the second time only took 5 hrs... (the 7.5 hr run the first time, I had more than a few sections where I didn't know what to do...)
The game certainly feels much, much longer than that, though...
Maybe it felt so much longer because it seemed intense, so I played it in short spurts of maybe 30 min each...