Game 1 took less than 30 minutes. Game 2 was pretty long (12 turns!) and we were both playing very tactical and cautiously in that game so I think it took nearly 90 minutes.
From the impression I got, you really need to play it in campaign mode to get the most out of it. It's the campaign rules that make the game - just like in Legends of the Old West and Strange Aeons. Once you get the hang of the rules it should be easy to fit at least 3 games into one afternoon, speeding up campaign play.
Played 3 games, 2 regular and 1 game where we did a little "alternate activation" test of the rules. I will be posting the remaining 2 reports soon as well.