[Endoperez]

That's the minimum in competitive multiplayer. In the beginning, and against the AI, you don't have to hurry. Depending on your tastes, you might never start playing against other people, and thus might never feel the need for such a rapid early expansion. It's easy to do with some tactics, and some nations have an easier time than others, so you'll probably manage to do it at some point even if you aren't going all out for it.