Stage entertainment turned over quickly in that era, with few productions exceeding a dozen performances, but Keene bucked those odds. An 1857 show called The Elves ran for a record 50 performances. Moreover, 1860 was to prove itself an important year for her theater and American drama as well. On 29 March, she premiered Dion Boucicault's The Colleen Bawn, which ran for six weeks until the end of the season on 12 May; the highlight of this play was the creation of an ocean island on stage in a scene which culminated with the hero diving into the ocean to save the colleen bawn Eily O'Connor. (Betting on the play's success, Boucicault took The Colleen Bawn to London, where it opened on 10 September 1860 and ran for 230 performances, becoming the first long run in the history of English theater.) In November 1860, Keene premiered the musical The Seven Sisters, which featured extravagant sets and ran for 253 performances, an astonishing total for the time.