I Love Lucy is an American television sitcom starring Lucille Ball, Desi Arnaz, Vivian Vance, and William Frawley. The black-and-white series originally ran from October 15, 1951 to May 6, 1957 on CBS. After the series ended in 1957, a modified version continued for three more seasons with 13 one-hour specials; it ran from 1957 to 1960. It was first known as The Lucille Ball-Desi Arnaz Show and later in reruns as The Lucy-Desi Comedy Hour.

After the conclusion of the sixth season of I Love Lucy, the Arnazes decided to cut down on the number of episodes that were filmed. Instead, they extended I Love Lucy to 60 minutes, with a guest star each episode. They renamed the show The Lucille Ball-Desi Arnaz Show, also known as The Lucy-Desi Comedy Hour. Thirteen hour-long episodes aired from 1957 to 1960. The main cast, Lucille Ball, Desi Arnaz, Vivian Vance, William Frawley and Little Ricky/Richard Keith (birth name Keith Thibodeaux) were all in the show. The Lucy-Desi Comedy Hour is available on DVD, released as I Love Lucy: The Final Seasons 7, 8, & 9. On March 2, Desi's birthday, 1960, the day after the last hour-long episode was filmed, Lucille Ball filed for divorce from Desi Arnaz. It made that playful, yet passionate kiss at the end of the final episode, which aired April 1, "Lucy Meets the Moustache", all the more poignant, as the world already knew that this storied Hollywood marriage was all but over, and also lent extra meaning to the use of the song "That's All" (performed by guest star Edie Adams) in that episode.  As already mentioned, Vance and Frawley were offered a chance to take their characters to their own spin-off series. Frawley was willing, but Vance refused to ever work with Frawley again since the two did not get along. Frawley did appear once more with Lucille Ball -- in an episode of The Lucy Show in 1965, which did not include Vance (who by then had ceased to be a regular on that show). However, this was his last screen appearance with his longtime friend. He died in Hollywood on March 3, 1966, of a heart attack at age 79.  In 1962, Ball began a six-year run with The Lucy Show, followed immediately in 1968 by six more years on a third sitcom, Here's Lucy, finally ending her regular appearances on CBS in 1974. Both The Lucy Show and Here's Lucy included Vance as recurring characters named Viv (Vivian Bagley Bunson on The Lucy Show and Vivian Jones on Here's Lucy), so named because she was tired of being recognized on the street and addressed as Ethel. Vance was a regular during the first three seasons of The Lucy Show but continued to make guest appearances through the years on The Lucy Show, and on Here's Lucy. In 1977, Vance and Ball were reunited one last time in the CBS special, Lucy Calls the President, which co-starred Gale Gordon.  In 1986, Ball tried another sitcom, Life with Lucy. The series debuted on ABC to very high ratings, landing in Nielsen's top 20 for that week. Its ratings quickly declined, however, and resulted in a cancellation after eight episodes.  In 1989, the never-seen pilot episode was discovered and revealed in a CBS television special, hosted by Lucie Arnaz, becoming the highest rated program of the season.

Answer the following question by taking a quote from the article: How long did the show run?
The Final Seasons 7, 8, & 9.