Perhaps a bit early to be asking since the game isn't out yet, but will the play time of the game go up as you continue to add more "years" to the game? I would expect that as you add more mechanics to the game, turns could become longer.
The first game is pretty short, probably about 30-45 min. Later games are closer to 1-1.5 hrs. Each game adds additional villains that must be defeated. The additional mechanics don't really add extra time. I haven't played game 6 or 7 yet, but I think 1.5 hours is about the average length of each game. Fortunately there isn't very much downtime between turns. It flows well and doesn't encourage Analysis Paralysis.