A period (heheh period) of time you give somebody to do something. This should be a maximum of one night and possibly half of the next day if it's really important. This is a promise that something will be done soon, but not right away. Violation of the one night max half way through the next day will incur a fee of $2 by the rule breaker.
e.g your girlfriend says that it will take her a while to forget a comment you made (not that you were wrong for making it), she has given you a verbal agreement that by tomorrow night all will be forgotten. If she claims this is not a rule than refer her to this definition... then get her to give you $2