text: Carson announced in April 1979 that he was leaving The Tonight Show after seventeen years hosting the program. At the time, media analysts estimated the show generated 17% of NBC's pre-tax profits. He negotiated a three-year deal to remain with the show in May 1980, reducing the program's length from ninety to sixty minutes while decreasing his workload from four to three nights each week.   Tom Snyder's Tomorrow added a half-hour to fill the vacant time. Joan Rivers became the "permanent" guest host from September 1983 until 1986. The Tonight Show then returned to using rotating guest hosts, including comic George Carlin. Jay Leno became the exclusive guest host in fall 1987. Leno joked that although other guest hosts had upped their fees, he had kept his low, assuring himself more bookings. Eventually, Monday night was for Leno, Tuesday for The Best of Carson—rebroadcasts usually dating from a year earlier, but occasionally from the 1970s.
  Although Carson's work schedule became more abbreviated, Tonight remained so successful that his compensation from NBC continued to rise; by the mid-1970s, he had become the highest-paid personality on television, earning about $4 million a year ($ today), not including nightclub appearances and his other businesses. He refused many offers to appear in films, including title roles in The Thomas Crown Affair and Gene Wilder's role in Blazing Saddles. He also declined director Martin Scorsese's offer to co-star with Robert De Niro in the 1983 film The King of Comedy, with the role of a TV talk-show host then going to Jerry Lewis.
  In recognition of his 25th anniversary on The Tonight Show, Carson received a personal Peabody Award, the board saying he had "become an American institution, a household word, [and] the most widely quoted American." They also said they "felt the time had come to recognize the contributions that Johnny has made to television, to humor, and to America."