How many trading days did the S&P 500 take to fall 30% during the 2020 stock-market crash?

The S&P 500 took 22 trading days to fall 30% during the 2020 stock-market crash.

The decline began in February 2020 as investors reacted to the global spread of COVID-19 and the prospect of widespread economic shutdowns. The index reached bear-market territory unusually quickly, making the episode one of the fastest major market collapses on record.

On March 16, 2020, the S&P 500 fell 11.98%, its worst daily percentage loss since 1987. Emergency interest-rate cuts, fiscal programs, and central-bank asset purchases followed as governments attempted to stabilize markets and economies.

The crash was followed by a rapid rebound from late March, although economic damage and market volatility continued. A 30% decline is a market statistic, not a formal definition of a crash; “bear market” generally means a fall of at least 20% from a recent peak.