I want to know the answer to the following question:
How long was symphonic instrumentation faithful to Beethoven's after he died?
All the background I'm provided with is that "The Ninth asks for a second pair of horns, for reasons similar to the "Eroica" (four horns has since become standard); Beethoven's use of piccolo, contrabassoon, trombones, and untuned percussion—plus chorus and vocal soloists—in his finale, are his earliest suggestion that the timbral boundaries of symphony should be expanded.". Is that enough to answer the question?
Answer: no