The image below is the interface for Administrator to set the expiration of sharing links. As you see, it can only be a number between 1 and 730, it cannot be a timeframe.
The expiration set by users for their shared files can only be shorter than or equal to this time limit.
When the file owners initially share files, they can set an expiration that is shorter than the one set by the Administrator.
If the file owners need to extend the expiration later, they may select shared files > 3 dot > Manage access > Links > More Options > Change expiration date > Save.
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