Short interest is the number of shares that investors are currently short on a particular stock. Days to cover is the number of days---based on the average trading volume of the stock---that it would take all short sellers to cover their short positions.
For instance, if a stock has a short interest of 20 million shares and an average trading volume of 10 million shares, days to cover would be two days (20 million / 10 million = 2 days).
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