No, no precise response, i think, without timer it's difficult to evaluate.
No other thread, i wondered some readers of this thread had played on other versions ... and could talk about their experiences.
I'd played Civ 2 long time ago, it seems to me that the games where longer than Civ 1, but i'm not sure. I've played Civ 4, too, tryed to love it, but leaved each time. I don't remember having finished 1 game !
As i remember, turns of play were long, looong, ... boring, finally ...