I always like "gimme a ballpark" as a request for a rough guess.

On an episode of Friends (sorry folks, I'm sadly addicted and refer to it often!), Monica's boyfriend, having been tipped off by another character that Monica has been with a lot of men, is asking her how many. She doesn't want to tell him, so he says, "Come on, just give me a ballpark," and she replies, "Okay - definitely LESS than a ballpark."

well, it was funny at the time - maybe you had to be there!

Let us go in peace to love and serve the board.