(1) It's similar to the velocity of turnover in the stock. A company with 100,000,000 shares outstanding that averages 1,000,000 shares traded per day has a "1% daily turnover". After 100 days, 100,000,000 shares have been traded, the entire floating supply. (2) A year or two ago, there was a guy in one of the popular trading magazines who said that time interval has "significance". (3) You could keep a running total of a company's trading volume and see if the time interval it takes to trade its float corresponds to major turning points in its stock.