paragraph_text: The story and concept of the episode was written by series co-creator Chuck Lorre and writers Steven Molaro and Eric Kaplan. The teleplay was written by co-creator Bill Prady, and writers Dave Goetsch and Maria Ferrari. "The Beta Test Initiation" was directed by Mark Cendrowski. The episode received positive reviews from television critics who described the episode as funny and one of the better episodes. "The Beta Test Initiation" garnered 15.96 million viewers in the United States and a rating of 5.4 in the 18–49 demographic, according to Nielsen ratings.

paragraph_text: In Canada, Prison Break was broadcast on Global one hour before it aired on Fox, except in the Maritimes where it aired two hours before Fox's airing. Prison Break was the only new television series to be positioned in the top twenty television shows of 2005–2006 in Canada, achieving an average of 876,000 viewers in the key demographic of 18–49 and 1.4 million viewers nationally for its first season. Prison Break premiered on Australian television network Seven on February 1, 2006, to an average audience of 1.94 million. The first season attracted an overall average of 1.353 million viewers. After decreasing ratings throughout the second season, Seven decided to fast-track the airing of the third-season episodes. The fifth season revival moved to Network Ten and debuted on May 15, 2017.The first and second seasons premiered in the UK on Five, with the first season being replayed on UKTV Gold before the second season debuted on Five. Prior to the start of the third season, Sky One acquired the rights to broadcast Prison Break, paying £500,000 per episode. The series premiered in France on August 31, 2006, with an average of 5.5 million viewers. The second season premiered on September 13, 2007, to 5.3 million viewers. The first season's broadcast in Hong Kong on TVB Pearl received the largest audience in the country for a foreign drama. The series premiere obtained an average of 260,000 viewers while the first-season finale obtained an average of 470,000 viewers. The second season's premiere received an average of 270,000 viewers.

paragraph_text: The show pushed Fox to become the number one U.S. TV network amongst adults 18–49, the key demographic coveted by advertisers, for an unprecedented eight consecutive years by 2012. Its success also helped lift the ratings of other shows that were scheduled around it such as House and Bones, and Idol, for years, had become Fox's strongest platform primetime television program for promoting eventual hit shows of the 2010s (of the same network) such as Glee and New Girl. The show, its creator Simon Fuller claimed, "saved Fox".

paragraph_text: "Welcome to Briarcliff" is the first episode of the of the anthology television series "American Horror Story", which premiered on October 17, 2012 on the cable network FX. In its original airing, the episode was watched by 3.85 million viewers, the largest audience of the franchise thus far, 2.8 million of which were from the 18–49 demographic.

paragraph_text: Season Episodes Originally aired Nielsen ratings First aired Last aired Network Rank Average viewership (in millions) 20 October 26, 2015 (2015 - 10 - 26) April 18, 2016 (2016 - 04 - 18) CBS 39 9.81 22 October 10, 2016 (2016 - 10 - 10) May 22, 2017 (2017 - 05 - 22) The CW 129 3.12 23 October 9, 2017 (2017 - 10 - 09) June 18, 2018 (2018 - 06 - 18) 154 2.82

paragraph_text: "Bonanza" is an American western television series developed and produced by David Dortort and broadcast in the United States for 14 seasons on the NBC network. The entire run of the series' 431 hour-long episodes was produced in color. The premiere was on September 12, 1959, and the final episode broadcast on January 16, 1973. In its initial season, "Bonanza" aired on Saturday evenings and placed at number 45 in the Nielsen ratings. During its second season, the series moved up to number 17. "Bonanza" was moved to Sunday nights at 9:00 PM at the start of its third season. In that time slot, the ratings soared and the series become second only to "Wagon Train" as the most popular program on American prime time television. It remained in the top ten of the ratings until its twelfth season and ranked at number one in its sixth, seventh, and eighth seasons. "Bonanza" also became a worldwide success as it was broadcast in nearly 50 countries, including Canada, Brazil, Yugoslavia, the United Kingdom, France, Italy, Switzerland, Saudi Arabia, Thailand, Australia, and Japan.

paragraph_text: Season eleven, however, suffered a steep drop in ratings, a drop attributed by some to the arrival of new shows such as The Voice and The X-Factor. The ratings for the first two episodes of season eleven fell 16–21% in overall viewer numbers and 24–27% in the 18/49 demo, while the season finale fell 27% in total viewer number and 30% in the 18-49 demo. The average viewership for the season fell below 20 million viewers the first time since 2003, a drop of 23% in total viewers and 30% in the 18/49 demo. For the first time in eight years, American Idol lost the leading position in both the total viewers number and the 18/49 demo, coming in second to NBC Sunday Night Football, although the strengths of Idol in its second year in the Wednesday-Thursday primetime slots helped Fox achieve the longest period of 18-49 demographic victory in the Nielsen ratings, standing at 8 straight years from 2004 to 2012.

paragraph_text: Tattingers (later Tattinger's) is an American comedy-drama series that aired by the NBC television network as part of its 1988 fall lineup. After failing in the Nielsen ratings as an hour-long program, the plot and characters were briefly revived in the spring of 1989 as the half-hour sitcom "Nick & Hillary".

paragraph_text: The Haves and the Have Nots is an American crime drama and soap opera created, executive produced, written, and directed by Tyler Perry. The premise of the series is based on Perry's 2011 play The Haves and the Have Nots. The show premiered on May 28, 2013 on the Oprah Winfrey Network. It is the first scripted television series to air on the network. Both the show's first and second episodes aired back - to - back on its premiere night. Each episode is one hour long.

paragraph_text: That's My Mama is an American television sitcom that was originally broadcast on the ABC network from September 4, 1974 until December 24, 1975. There are 39 episodes of this series. "That's My Mama" was never a ratings success. It was not one of the top 30 most-watched U.S. programs in the Nielsen ratings for either the 1974–1975 or 1975–1976 television seasons. As a result, the series ended on Christmas Eve of 1975. It was the first series to be produced by Columbia Pictures Television.

paragraph_text: The Gates is an American supernatural crime drama television series that aired on the ABC network from June 20, 2010 to September 19, 2010. The show was cancelled after its first season due to low ratings.

paragraph_text: The first season of 90210, an American television series, began on September 2, 2008. Gabe Sachs and Jeff Judah are executive producers for the first season, after original producer Rob Thomas dropped out to focus on other projects. The series premiered to 4.65 million viewers, and broke records for The CW at the time, becoming their highest rated premiere in viewers and in Adults 18 -- 49 with a 2.6 rating. On September 22, 2008, after airing just four episodes, the network gave the series a full - season order of 24 episodes.

paragraph_text: In season ten, the total viewer numbers for the first week of shows fell 12–13%, and by up to 23% in the 18–49 demo compared to season nine. Later episodes, however, retained viewers better, and the season ended on a high with a significant increase in viewership for the finale – up 12% for the adults 18–49 demo and a 21% increase in total viewers from the season nine finale. While the overall viewer number has increased this season, its viewer demographics have continued to age year on year – the median age this season was 47.2 compared to a median age of 32.1 in its first season. By the time of the 2010–11 television season, Fox was in its seventh consecutive season of victory overall in the 18–49 demographic ratings in the United States.

paragraph_text: "97 Seconds" is the third episode of the fourth season of "House" and the seventy-third episode overall. It aired on October 9, 2007.

paragraph_text: Operation Information was a DuMont Television Network public affairs TV show giving veterans information on their rights and benefits. The show aired Thursdays from July 17, 1952 to September 18, 1952. DuMont had previously aired a similar series for veterans "Operation Success" (1948-49).

paragraph_text: "Slack Water" is the tenth episode of the American television police procedural fantasy drama "Awake", which originally aired on NBC on May 3, 2012. Written by Noelle Valdivia and directed by Nick Gomez, "Slack Water" was watched by 2.15 million viewers, including 0.7 percent of those aged between 18 and 49 in Nielsen ratings, upon its initial broadcast in the United States. Critics were largely positive in their reviews of the installment.

paragraph_text: Realized for its gritty, realistic drama, St. Elsewhere gained a small yet loyal following (the series did not rank higher than 49th place in the yearly Nielsen ratings) over its six - season, 137 - episode run; the series also found a strong audience in Nielsen's 18 -- 49 age demographic, a young demo later known for a young, affluent audience that TV advertisers were eager to reach. The series also earned critical acclaim during its run, earning 13 Emmy Awards for its writing, acting, and directing. St. Elsewhere was ranked No. 20 on TV Guide's 2002 list of ``The 50 Greatest TV Shows of All Time '', with the magazine also selecting it as the best drama series of the 1980s in a 1993 issue. In 2013, TV Guide ranked the series No. 51 on its list of the 60 Best Series of All Time.

paragraph_text: The seventh season of the CBS police procedural drama series Hawaii Five - 0 premiered on Friday September 23, 2016, and concluded on May 12, 2017. The season contained 25 episodes, and the series's 150th episode. For the 2016 - 17 U.S. television season, the seventh season of Hawaii Five - 0 ranked # 15 with an average of 12.15 million viewers, and in the 18 -- 49 demographic ranked 43rd with a 1.8 / 7 Rating / Share.

paragraph_text: Junkin' with Val and Dave was a television show which aired on the Turner South cable network. The program was Turner South's highest rated original production.

paragraph_text: The loss of viewers continued into season 12, which saw the show hitting a number of series low in the 18-49 demo. The finale had 7.2 million fewer viewers than the previous season, and saw a drop of 44% in the 18-49 demo. The season viewers averaged at 13.3 million, a drop of 24% from the previous season. The thirteenth season suffered a huge decline in the 18–49 demographic, a drop of 28% from the twelfth season, and American Idol lost its Top 10 position in the Nielsen ratings by the end of the 2013–14 television season for the first time since its entry to the rankings in 2003 as a result, although the entire series to date had not yet been dropped from the Nielsen Top 30 rankings since its inception in 2002.

Question: How long did the network that originally aired the series with an episode called 97 seconds dominate the 18-49 demographics of the Nielsen ratings?
Answer: eight years