Two old ladies have played bridge together

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?"