Methodology: look up symphony in YouTube by typing, e.g., “shostakovich symphony 15”. The length of each result, in minutes is used, rounded to the nearest minute (30 second is rounded up). Use four first useful results, calculate mean length.

Data

I was sure Shostakovich’s 4th symphony was his longest. I wasn’t aware of how short many Mozart symphonies are.

Beethoven. Brahms. Bruckner. Dvorak. Mahler. Mendelssohn. Mozart. Shostakovich. Tchaikovsky.