$2million in one day.
That day, I came in flat. I bought $12m portfolio value across a basket of Reits and Broker Dealers first 10 minutes of the trading day when the US govt outlawed short selling financials in 2008. They gapped up 2%. By 9:40, I was long $8m and added another $4m when they made intraday highs.
What kept me in for nearly 20% move intraday was that this was not a normal market. If you were following the markets in late 2008, sectors would trend up or down 5-10% intraday everyday for several months. The pattern back then was to hold unprecedented intraday trends. I had several $500k loss days during this period. This was the most volatile year I experienced on my P&L in my 15 years of trading.