Old Ladies Playing Bridge

Two old ladies have played bridge together for many years, and naturally they have gotten to know each other pretty well. One day, during a game of cards, one lady suddenly looks up at the other and says, "I realize we've known each other for many years, but for the life of me, I just can't bring it to mind... would you please tell me your name again, dear?" There is dead silence for a couple of minutes, then the other lady responds, "How soon do you need to know?"