Stocks hit a bottom in 1933, made it back to that level in 1954.
21 years is often considered a generation.
However, even shortly after the Wall Street Crash of 1929, optimism persisted; John D. Rockefeller said that "These are days when many are discouraged. In the 93 years of my life, depressions have come and gone. Prosperity has always returned and will again."
Arf