the markets of the teams involved. Due to this rule, game telecasts may sometimes overrun into the 7:00 p.m. ET hour. Fox previously scheduled repeats of its animated series in the 7:00 hour, allowing themselves to simply pre-empt the reruns if a game ran long. This was later replaced by a half-hour-long wrap-up show, The OT. In contrast, CBS does not, as its weekly newsmagazine 60 Minutes has traditionally aired as close to 7:00 p.m. ET as possible. Even if a game runs past that hour, CBS shows 60 Minutes in its entirety after the conclusion of coverage, and the rest of the prime-time schedule on the East Coast is shifted to compensate. For example, if game coverage were to end at 7:30 p.m., prime time would end at 11:30 p.m. However, in the rare case where the NFL game runs excessively late (8p.m. or later), the series scheduled to air at 10p.m. is preempted, with the West Coast and eastern markets airing only an early afternoon game usually receiving a repeat of the 10p.m. series instead. In an extreme case, CBS's prime time can be extended past midnight during broadcasts of the NCAA Division I men's basketball tournament. This does not necessarily apply universally; in 2001, after an XFL game went into double overtime, causing a 45-minute delay of a highly promoted episode of Saturday Night Live, NBC made a decision to cut off all future XFL broadcasts at 11:00 p.m. ET. Since the launch of NBCSN, NBC has occasionally invoked this curfew by moving sports overruns to that channel if necessary. Until the Federal Communications Commission (FCC) regulated time slots prior to prime time with the now-defunct Prime Time Access Rule in the 1971–1972 season, networks began programming at 7:30 p.m. Eastern and Pacific/6:30 p.m. Central and Mountain on weeknights. The change helped instigate what is colloquially known as the "rural purge"—a long-term trend away from programs appealing to older and rural audiences in favor of programs catering towards younger, "urban" viewers. As a result, the hour became a lucrative timeslot for syndicated programming in the years that followed, with game show and variety show, as well as other syndicated reruns, becoming popular. The vast majority of prime-time programming in English-speaking North America comes from the United States, with only a limited amount produced in Canada. The Canadian Radio-television and Telecommunications Commission mandates quotas for Canadian content in