Definition of posting period

duration of time that an outdoor or transit advertisement is scheduled to be displayed, as specified in a contractual agreement. A posting period is most commonly 30 days, but may also be as long as 12 months. Posting periods for painted displays, which are generally customized and have a long life, are usually longer than for other types of outdoor advertising or transit advertising, and are almost always one, two, or even three years. To maximize flexibility, advertisers will generally try to keep their posting periods short and extend them if satisfied with results.