The jump in average daily volume in the past month is about 1 million more shares. So the days to cover seems like it is dropping relative to the short interest. But the problem the shorts have is that when there is a short squeeze, the volume dries up because no one wants to sell, and the only way for them to unload the shares is to chase the bid up. When you liquidate a short account, the broker does not care. They want to get out as fast as possible, so they will just put in market orders and that just takes out bids too quickly and the prices starts to jump past stops, which just starts the chain reaction.