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?

full_context: Document 1: American Idol: American Idol premiered in June 2002 and became the surprise summer hit show of 2002. The first show drew 9.9 million viewers, giving Fox the best viewing figure for the 8.30 pm spot in over a year. The audience steadily grew, and by finale night, the audience had averaged 23 million, with more than 40 million watching some part of that show. That episode was placed third amongst all age groups, but more importantly it led in the 18–49 demographic, the age group most valued by advertisers.
Document 2: American Idol: American Idol became the most expensive series on broadcast networks for advertisers starting season four, and by the next season, it had broken the record in advertising rate for a regularly scheduled prime-time network series, selling over $700,000 for a 30-seconds slot, and reaching up to $1.3 million for the finale. Its ad prices reached a peak in season seven at $737,000. Estimated revenue more than doubled from $404 million in season three to $870 million in season six. While that declined from season eight onwards, it still earned significantly more than its nearest competitor, with advertising revenue topping $800 million annually the next few seasons. However, the sharp drop in ratings in season eleven also resulted in a sharp drop in advertising rate for season twelve, and the show lost its leading position as the costliest show for advertisers. By 2014, ad revenue from had fallen to $427 million where a 30-second spot went for less than $300,000.
Document 3: American Idol: The declining trend however continued into season eight, as total viewers numbers fell by 5–10% for early episodes compared to season seven, and by 9% for the finale. In season nine, Idol's six-year extended streak of perfection in the ratings was broken, when NBC's coverage of the 2010 Winter Olympics on February 17 beat Idol in the same time slot with 30.1 million viewers over Idol's 18.4 million. Nevertheless, American Idol overall finished its ninth season as the most watched TV series for the sixth year running, breaking the previous record of five consecutive seasons achieved by CBS' All in the Family and NBC's The Cosby Show.
Document 4: American Idol: 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".
Document 5: Seven Seconds (TV series): Seven Seconds is an American crime drama web television series that follows the people involved in investigating the death of a young black boy and the boy's family as they reel after the loss. Veena Sud is the series' creator and executive producer / showrunner, and Gavin O'Connor is the director and executive producer. The series, produced by Fox 21 Television Studios, is based on the Russian movie The Major (2013), written and directed by Yuri Bykov. The first season, consisting of 10 episodes, was released on Netflix on February 23, 2018.
Document 6: American Idol: Season six premiered with the series' highest-rated debut episode and a few of its succeeding episodes rank among the most watched episodes of American Idol. During this time, many television executives begun to regard the show as a programming force unlike any seen before, as its consistent dominance of up to two hours two or three nights a week exceeded the 30- or 60-minute reach of previous hits such as NBC's The Cosby Show. The show was dubbed "the Death Star", and competing networks often rearranged their schedules in order to minimize losses. However, season six also showed a steady decline in viewership over the course of the season. The season finale saw a drop in ratings of 16% from the previous year. Season six was the first season wherein the average results show rated higher than the competition stages (unlike in the previous seasons), and became the second highest-rated of the series after the preceding season.
Document 7: American Idol: 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.
Document 8: Grey's Anatomy (season 4): Grey's Anatomy (season 4) DVD cover art for the fourth season of Grey's Anatomy Starring Ellen Pompeo Sandra Oh Katherine Heigl Justin Chambers T.R. Knight Chandra Wilson James Pickens, Jr. Sara Ramirez Eric Dane Chyler Leigh Brooke Smith Patrick Dempsey Country of origin United States No. of episodes 17 Release Original network ABC Original release September 27, 2007 (2007 - 09 - 27) -- May 22, 2008 (2008 - 05 - 22) Season chronology ← Previous Season 3 Next → Season 5 List of Grey's Anatomy episodes
Document 9: American Idol: 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.
Document 10: A Measure of Salvation: "A Measure of Salvation" is the seventh episode of the third season from the science fiction television series "Battlestar Galactica".
Document 11: American Idol: The loss of viewers continued into season seven. The premiere was down 11% among total viewers, and the results show in which Kristy Lee Cook was eliminated delivered its lowest-rated Wednesday show among the 18–34 demo since the first season in 2002. However, the ratings rebounded for the season seven finale with the excitement over the battle of the Davids, and improved over season six as the series' third most watched finale. The strong finish of season seven also helped Fox become the most watched TV network in the country for the first time since its inception, a first ever in American television history for a non-Big Three major broadcast network. Overall ratings for the season were down 10% from season six, which is in line with the fall in viewership across all networks due in part to the 2007–2008 Writers Guild of America strike.
Document 12: 97 Seconds: "97 Seconds" is the third episode of the fourth season of "House" and the seventy-third episode overall. It aired on October 9, 2007.
Document 13: Known Unknowns: "Known Unknowns" is the seventh episode of the sixth season of "House" and 117th overall. It aired on November 9, 2009. The team tries to diagnose a teenage girl while House is away at a medical conference with Wilson and Cuddy. At the conference House finds something out about Cuddy.
Document 14: American Idol: 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.
Document 15: American Idol: The enormous success of the show and the revenue it generated was transformative for Fox Broadcasting Company. American Idol and fellow competing shows Survivor and Who Wants to Be a Millionaire were altogether credited for expanding reality television programming in the United States in the 1990s and 2000s, and Idol became the most watched non-scripted primetime television series for almost a decade, from 2003 to 2012, breaking records on U.S. television (dominated by drama shows and sitcoms in the preceding decades).
ground_truth: eight years
sub_queries: To which series does 97 Seconds belong? Answer: House
What television network originally aired the show House ? Answer: Fox
How long did Fox reign in the 18-49 demographics in the Nielsen ratings? Answer: eight years