Background: Richard John Grayson is a fictional character, a superhero appearing in American comic books published by DC Comics, commonly in association with Batman. Created by writer Bill Finger and artist Bob Kane, he first appeared in Detective Comics #38 in April 1940 as the original incarnation of Robin. In Tales of the Teen Titans #44 (July 1984) the character retires his role as Robin and assumes the superhero persona of Nightwing, created by Marv Wolfman and artist George Perez. The youngest in a family of Gotham City acrobats known as the "Flying Graysons", Dick watches a mafia boss kill his parents in order to extort money from the circus that employed them.
Context: 1964's The Brave and the Bold #54 introduces a junior version of the Justice League of America; an all-star superhero team of which Batman was a part. This team is led by the modern-day Robin, residing on Earth-One, and was joined by two other teenage sidekicks, Aqualad (sidekick of Aquaman) and Kid Flash (sidekick of the Flash), to stop the menace of Mr. Twister.  Later, the three sidekicks join forces with Speedy and Wonder Girl in order to free their mentors in the JLA from mind-controlled thrall. They decide to become a real team: the Teen Titans. By virtue of the tactical skills gleaned from Batman, Robin is swiftly recognized as leader before the Titans disband some years later.  In 1969, still in the Pre-Crisis continuity, writer Dennis O'Neil and artist Neal Adams return Batman to his darker roots. One part of this effort is writing Robin out of the series by sending Dick Grayson to Hudson University and into a separate strip in the back of Detective Comics. The by-now Teen Wonder appears only sporadically in Batman stories of the 1970s as well as a short lived revival of The Teen Titans.  In 1980, Grayson once again takes up the role of leader of the Teen Titans, now featured in the monthly series The New Teen Titans, which became one of DC Comics's most beloved series of the era. During his leadership of the Titans, however, he had a falling out with Batman, leading to an estrangement that would last for many years.
Question: How many years did the show last?

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