(without reading anything after the OP)
In my opinion until the author's death, or until the date of his/hers 80th birthday; whichever is longer.
Example: Joe writes a novel while he is 40. So he gets 40 years of copyright, and if he dies with 60, his ancestor benefit from the copyright 20 more years. A bit like continuing a successful family business.
After the copyright time - free domain.
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