Not a musical, but I went to see Nicholas Nickelby at the Palace Theatre, in the early 80s. It was split into an afternoon session lasting 4 hours, and an evening session lasting 4.5 hours. I had no money even for a drink in between the sessions. Just enough for the bus back home afterwards. I really enjoyed it though.Seen live - Oliver
On film - Rocky horror, seven brides or west side story
Longest - though more a variety show was a mor lam mu live peformance in Issan, last 4.5hrs
Shut your fucking face, uncle fucker!South Park: Bigger, Longer and Uncut
I agree with that 100%.Les Mis by a country mile.
Emotionally it is an absolute masterpiece.
Is the correct answer. Although very influenced by Les Mis musically.South Park: Bigger, Longer and Uncut