no, I mean a typical Civ game takes 12 - 20 (or more) hours. They stripped it down a bit in the newer versions of the game, reducing the number of turns without too much of a noticeable effect, but it's still an epic way to waste time.
the thing is, it's not like you're doing one thing repetitively that entire time... certain goals take hours to complete, like researching technologies and building things. before you know it, you've literally blown an entire afternoon and are mentally juggling personal responsibilities ("I guess I can go to the gym tomorrow... I didn't NEED to do my taxes this weekend... I don't have any early meetings tomorrow, I can sleep in a bit and get to work late..."). because it's turn based instead of real-time like the Ages games, you don't have the constant time pressure, so you plan more; think more, etc.