So some friends of mine are wanting to get together and play as a team in some sort of epic nations of history type game and Civ 4 has been suggested. I've played it a couple of dozens times but always as the only human playing pure turn-based vs AI where I can just save and come back later. If we all play online together with ourselves plus a bunch of AI, how does this work? Are we able to play with simultaneous turns for a while, and then have someone save the game, and come back to it later? Or does sim-turns mean you have to finish it all in one session, and so if we want to play it over multiple sessions we'd have to do asynchronously even if we're all online at once?