scenario also,which is supposed to be the same basic problem: Tickets go on sale two months ahead of time for a concert by a band you are somewhat interested in seeing, but it is not a must-see band for you, not one of your favorite bands. You go to the box office (because the tickets are not on sale online)and the line is long but should move quickly. However, it does not move quickly, and after various promising starts you find you have been waiting inline for nearly three hours, but it will be just twenty more minutes (for sure).
Fig: 1
Fig: 2