Share file for hours

Technically yes but not out of box. You can easily design a power automate flow Thay shares a file. Pauses for any number of minutes / hours / days and then wakes up after that pause and Unshares the file.

Hi,
AFAIK no, the time unit used for sharing links expiration is days.
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Hola,
Creo que no, la unidad de tiempo utilizada para establecer un tiempo de expiración a enlaces de compartir es el día