The days to cover statistic indicates the number of days it would take to a short seller to cover the open position. An increase in days to cover indicates that number of shares available to cover short positions is decreasing and making it difficult for short sellers to close their open short positions.
I day to cover means the the short seller can cover or buy shares to close their position in one daily session.
5 days to cover means the likelihood of covering in a daily session may not be possible if the average share volume remains nearly the same.
How?
Days to cover is determined by the dividing the average number of shares traded per day into the current short interest number of shares. This is called the "short-interest ratio."
So when the current short interest is significantly greater than the average daily volume there are less shares available to buy by the short sellers with short positions open.
A short squeeze can happen if the prices suddenly goes up without a corresponding increase in average share volume.
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