One of the pluses to CivRev is you can finish in 2-3 hours. It still has an addictive draw because there aren't natural stop points - you'll keep setting mini targets 'when I've got that city; when I've researched that tech; when I've found the end of this landmass' and rarely find a comfortable place to stop, but if you get a spate to play you have the chance of finishing the game, or getting halfway, making the games more like a light lunch than a 10 course meal.