Mottl, Felix. Article #27. Vol 8, pg 369.
Felix Mottl (1856-1911) was a Austrian conductor, best known for conducting the operas of Richard Wagner. He was the conductor at the Karlsruhe Opera from 1882 to 1903. While there, he was known for conducting all of the operas of both Berlioz and Wagner. Given the length of Wagner’s operas, this at least indicates that Felix was a man with a lot of stamina.
“Mottl, Felix.” Encyclopedia Britannica. 15th ed. 2010. Vol 8, pg 369.