Question: Steven Randall "Randy" Jackson's sister has been a prominent figure in popular culture for over how many years?
Context: The influence of Countess Elizabeth Báthory in popular culture has been notable from the 18th century to the present day.  Since her death, various myths and legends surrounding her story have preserved her as a prominent figure in folklore, literature, music, film, games and toys. The Crow Terrace Poetry Trial (or Crow Terrace Poetry Case, 烏臺詩案) was a trial on charges including treason, or, lèse majesté (Sung Criminal Code, Article 122: "Denouncing the Imperial Chariot") that occurred in the year 1079 (during the Song dynasty) era of China (960–1279).  "Crow Terrace" refers to the imperial Office of the Censorate (御史臺), which prosecuted the case, a nickname.  The most prominent figure of the numerous accused parties was the official and artist Su Shi (1037 – 1101), whose works of poetry were produced in court as evidence against him.  Of the several tens or dozens accused, the most prominent figure was the remarkable artist and political leader Su Shi, whose works of poetry were produced as a key part of the evidence against him.  The Crow Terrace Poetry Trial was a major landmark in the struggle for free speech, in medieval China; and, as the outcome of the judicial proceedings resulted in Su Shi's conviction and sentence to exile, as well as the conviction and sentencing to various punishments of over 30 other individuals (some or many of whom were let off with fines and reprimands), the Crow Terrace Poetry Trial had the significant effect of dampening subsequent creative expression and set a major negative precedent for freedom of speech, at least for the remainder of Song Dynasty China.  Besides the significance of the Crow Terrace Poetry Trial for Su Shi and poetry, it is also a rather remarkably well-documented instance of a medieval Chinese literary prosecution, with surviving copies of indictments, arguments, case disposition; not to mention numerous of Su Shi's poems, which were entered as evidence. Jayne Mansfield was an actress, singer, playmate and stage show performer who had an enormous impact on popular culture of the late 1950s despite her limited success in Hollywood.  She has remained a well-known subject in popular culture ever since.  During a period between 1956 and 1957, there were about 122,000 lines of copy and 2,500 photographs that appeared in newspapers.  In an article on her in the "St. James Encyclopedia of Popular Culture" (1999), Dennis Russel said that "Although many people have never seen her movies, Jayne Mansfield remains, long after her death, one of the most recognizable icons of 1950s celebrity culture."  In the 2004 novel "Child of My Heart" by Alice McDermott, a National Book Award winning writer, the 1950s is referred to as "in those Marilyn Monroe/Jayne Mansfield days".  R. L. Rutsky and Bill Osgerby has claimed that it was Mansfield along with Marilyn Monroe and Brigitte Bardot who made the bikini popular. Marshall William Fishwick (July 5, 1923 – May 22, 2006) was an American multidisciplinary scholar, professor, writer, and editor who started the academic movement known as popular culture studies and established the journal "International Popular Culture".  In 1970 he cofounded the Popular Culture Association with Ray B. Browne and Russel B. Nye, and the three worked to shape a new academic discipline that blurred the traditional distinctions between high and low culture, focusing on mass culture mediums like television and the Internet and cultural archetypes like comic book heroes.  In an academic career of more than fifty years, Fishwick wrote or edited more than forty books, including works on popular culture, Virginia history, and American studies. Adolf Hitler (20 April 1889 – 30 April 1945) was the leader of the National Socialist German Workers' Party and Chancellor of Nazi Germany from 1933 (Führer from 1934) to 1945.  Hitler has been represented in popular culture ever since he became a well-known politician in Germany.  His distinctive image was often parodied by his opponents.  Parodies became much more prominent outside Germany during his period in power.  Since the end of World War II representations of Hitler, both serious and satirical, have continued to be prominent in popular culture, sometimes generating significant controversy.  In many periodicals, books, and movies, Hitler and Nazism fulfill the role of archetypal evil.  This treatment is not confined to fiction but is widespread amongst nonfiction writers who have discussed him in this vein.  Hitler has retained a fascination from other perspectives; among many comparable examples is an exhibition at the German Historical Museum which was widely attended. Janet Damita Jo Jackson (born May 16, 1966) is an American singer, songwriter, dancer and actress.  Known for sonically innovative, socially conscious, and sexually provocative records, elaborate stage shows, and high-profile television and film roles, she has been a prominent figure in popular culture for over 30 years. The winged, divine horse Pegasus has been a prominent figure in modern popular culture. Kay Tse On-kay (; born 13 March 1977) is a Hong Kong Cantopop singer.  She is a prominent figure in Hong Kong music and popular culture and is frequently referred to in the media as a "grass-roots diva" and "goddess."  She is known for songs which deal with social issues and the struggle for democracy in Hong Kong. Steven Randall "Randy" Jackson (born October 29, 1961) is an American singer-songwriter, musician and dancer.  Jackson is best known as a former member of his family band, The Jacksons.  Jackson was the youngest son and the second youngest Jackson sibling before his sister Janet Jackson was born. Andi Zeisler (born c. 1972) is a co-founder and creative/editorial director of "Bitch Media", a nonprofit feminist media organization based in Portland, Oregon.  Zeisler's writing, which focuses mainly on feminist interpretations of popular culture, has been featured in a variety of publications including "Mother Jones", the "San Francisco Chronicle", Utne Reader, The Women's Review of Books, and "Ms." She is a former pop-music columnist for the "SF Weekly" and the "East Bay Express", and also contributed to the anthologies "Young Wives' Tales", "Secrets and Confidences: The Complicated Truth About Women's Friendships" (both from Seal Press), and "Howl: A Collection of the Best Contemporary Dog Wit" (Crown).  She is the coeditor of "BitchFest: 10 Years of Cultural Criticism from the Pages of Bitch Magazine", and a book about feminism and popular culture for Seal Press, "Feminism and Pop Culture".  She frequently speaks on issues of feminism and popular culture on college and university campuses.
Answer: 30