Game duration is a touchy subject - well, not really touchy, but I know a lot of gamers who won't, as an example, play a game that runs more than 1.5 hours. Personally I prefer games that can go 2 or 3 hours.
Anyway, I'm working out my prototype and it has a play time of between 120 and 150 minutes, which I have recently discovered is something of a turn off to a lot of designers in my area who seem to favour 90 minute max as play time.
So what do you think? What duration of play time do you prefer in a game?
And let me guess, this is for your regular testers with you nearby and/or playing, right?
Then for an actual first-time player it will be more like 3+ hours, or more, depending on the weight of the game and how good the rulebook is.
A death sentence for a game (since after that first experience, the chance of the game leaving the shelf will be slim).
Actually, most of my play testers are one-off players. People who have played the game either never, or only once. I have only about 3 play testers who have played more frequently than that, and they can play in about 90 minutes. Typical first time players are between 2 and 2.5 hours. Really goofy and/or chatty ones skyrocket to over 3 hours.