How many hours should a single player game today be to warrant a sixty dollar purchase?

[Barozi]

S.T.A.G.E. said:

Barozi said:
6-8 hours is enough and with that they would offer far more entertainment value than a movie.

Interesting, because that just as much as the heavy online games have and the rest of the hours are sated through multiplayer. For a single player game is six truly justifiable? I mean seriously, look at the Force Unleashed 2 and Enslaved. They could've been so much more if they lasted longer. Games demand a different type of care than movies and sixty dollars is quite a bit. If I had a choice most 6-8 hour titles would be $30 to 40 dollars. I bought Black Ops 2 yesterday for $40 and I felt like I got the biggest deal in the world. Why? Because the game is quite robust in its offerings that its well worth a price I wasn't willing to pay just yet. I waited for the sales and got it at a great price while the popularity of the game was still rather high. 

It's all relative. I only see people bitch about game prices in combination with their length and no one doing the same with Blu-Ray prices. If you don't like them, buy'em later it doesn't change the fact that games are still among the cheapest forms of entertainment after books, even though they take much more manpower, time and thus money to produce.

Obviously 6 hours for an RPG or sandbox game are too short, since most of these games involve running around without really doing anything (aka wasted time) and lots of storytelling etc.