Does Werther or War and Peace have more acts?
Werther Werther is an opera ("drame lyrique") in four acts by Jules Massenet to a French libretto by Édouard Blau, Paul Milliet and Georges Hartmann (who used the pseudonym Henri Grémont). It is loosely based on the German epistolary novel "The Sorrows of Young Werther" by Johann Wolfgang von Goethe, which was based both on fact and on Goethe's own early life. Earlier examples of operas using the story were made by Kreutzer (1792) and Pucitta (1802).
Wuthering Heights (1951 opera) Wuthering Heights is the sole opera written by Bernard Herrmann. He worked on it from 1943 to 1951. It is cast in a prologue, 4 acts, and an epilogue that repeats the music of the prologue. The opera was recorded in full by the composer in 1966, but it had to wait until April 2011, the centenary of the composer's birth, for a complete theatrical performance (there was an abridged stage production in 1982 and a concert version in 2010).