Do not believe possible. My local library has a "normal" due date of 3 weeks from date of marking the book for loan & available for download. Then there are also many books that is for loan for just 2 weeks; another case is the the loan time is from a library in the consortium or borrowed from a university by the local library where the loan date is marked as available for download.
So which due date will anyone want the Calibre to "calculate"?
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