How long did Sergey Prokofiev work on his opera War and Peace?

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Portrait of composer Sergey Prokofiev, circa 1938, wearing round glasses, a suit, and a tie, looking slightly to the side. — Sergey Prokofiev Sergey Prokofiev.

Sergey Prokofiev began working on his opera War and Peace at the start of World War II. While he completed the first version by the summer of 1942, he subsequently undertook a fundamental revision of the work, a process that occupied more than 10 years of intensive effort.1