average play time?

I'm just curious, because this game looks interesting. But for how long do a game last on average?  Is it intended to be short games less than 60 minutes? I'm a single player only! I like games that lasts for a long time with a lot of gameplay content. Grand strategy game and 4X are preferred. 

I like Galciv3 and Sorcerer King - lots of gameplay and it takes hours to finish.

Is this a game for me?