The problem is that a 21-day borrow is too long. Most people borrow for the full time and if it's 21-days then they keep it out for 21-days. Most people do not even know that you can return early. 14-days should be the max borrow length given how long the wait lists are getting.
So if you belong to a library that allows 21-days, please tell the librarian you want that backed down to 14-day.
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