I too have heard the positive version of the rule. The randomness might be intentional, so as to make one wait a random but not too large number of months, perh

I too have heard the positive version of the rule. The randomness might be intentional, so as to make one wait a random but not too large number of months, perhaps to discourage marrying in haste or as an artificial (but reasonable) constraint on planning to increase the perceived value of the event.