Answer
The answer to the question is seven. Muni played seven distinct characters in the 1929 silent film'Seven Faces', also known as'The Man of a Thousand Faces'. The film, directed by Berthold Viertel, showcases Muni's versatility and acting prowess as he portrays a range of characters, including an old man, a young woman, a priest, a clown, and a soldier, among others.