I've just recently spoken with my friends, and I know for a fact that it atleast takes a month from point of checkin to review/test/stage/production. If you disagree, I think what you are talking about, is probably an exception and not the norm.
Being secretive about release cycles is pointless stealth.
I still know for a fact that, it takes at-least a month on average, for a search change list to reach production. Would you disagree Matt?