Which of Richard Wagner opera's is the longest?

Answer 1

Wagner's longest single Opera is Die Meistersinger von Nurnberg, at something over 5 hours. Sometimes mentioned as the longest is Der Ring des Nibelungen, but that is in reality four operas that form a tetralogy telling the story of the God Wotan, his daughter, Brunnhilde, the hero, Siegfried, and how they are all involved with the magic power-ring created by the dwarf, Alberich, from the stolen gold in the Rhine river.