I believe modern people have been conditioned by the two hour motion picture (including cartoon, short subject, newsreel, and previews) program from the 30s through the 50s. The 5 hour marathon of musical entertainment of the 18th and 18th centuries is no longer really acceptable; I couldn't make it.

Operas no longer are presented with the ballet that once was required (at least in Paris), are they?
Regerds, Pete