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Re:Average stock ownership: 22 seconds by AndyParkinson on Sunday January 09, 2011 @03:18AM (#2085142)
Here's something that might help... According to http://www.nytimes.com/2010/05/07/business/economy/07trade.h...

"In recent years, what is known as high-frequency trading — rapid automated buying and selling — has taken off and now accounts for 50 to 75 percent of daily trading volume."

From what I've read, its gotten pretty ridiculous overall.

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