How many trading minutes did the major price collapse of the 2010 Flash Crash last?

The major price collapse of the 2010 Flash Crash lasted about 36 minutes.

On May 6, 2010, U.S. stock markets experienced a rapid plunge beginning at about 2:32 p.m. Eastern Time. Major indexes recovered much of the loss by about 3:07 p.m., making the most dramatic phase roughly 36 minutes long.

The Dow dropped nearly 1,000 points, or about 9%, during the episode before recovering. Some individual securities briefly traded at extremely low prices, while others showed unusually high quotations. The event revealed how electronic markets could transmit selling pressure at extraordinary speed.

Investigations later focused on a large automated futures transaction and the interaction of algorithmic trading, liquidity providers, and market safeguards. The Flash Crash was not the same as a conventional multi-month bear market; it was a sudden intraday market disruption.