Alterego-X on 13 April 2009
Of course it is entirely depending on the genre.
If it's any cinematic experience to "play through", it can't be longer than a few hours.
Some other games are designed to be used whenever I want to do stuff with its sandbox, often for HUNDREDS of hours. In their case, the longer, the better.
I prefer the latter, it just sucks when my games tell me when to stop playing them.
