The choices are:

1) 3 billion years
2) 4 billion years
3) 5 billion years
4) Random

Please vote and discuss. This poll will end in 4 days

I usually like 5 billion, as there are less mountains and it's easier to get good city spots. :)

Four billion, just because I don't like one civ having a monopoly over a resource.

I always choose Random for this topic, so I will do the same here. :)