It's always disappointing to get a brand new game that kicks ass right up until the end of the game, which is only a few hours away. Sure, it's great that the game kept you completely entertained the entire way through, but only getting 5 or 6 hours out of a game really sucks. Like with the other Grand Theft Auto titles, you aren't going to have to worry about polishing off GTA 4 in just one all-night gaming session.
According to a spokesman for RockStar Games "if you're not in a rush and you answer the phone when it rings it'll take about 100 hours to complete." Of course that likely doesn't even take into account the many hours spent randomly driving around trying to do the craziest stunts possible.
I'm glad to see a title like this which will really get me the most bang for my buck. I love games that I can put down for a while and pick back up later, and I think GTA 4 will be one of those games. The only problem will be actually putting it down.