This should absolutely not be hard-coded and rather run when it is appropriate over the course of a day. As I have suggested, if the files that get moved into trash get stored in a database with their modification times, any future deletion day can be calculated from that and then it is only a query to the database once a day which files to delete which can be put into a low priority background task for final deletion over the course of a day.
This hard-coded sounds also weird. My gut feeling is telling me this should be a setting controlled by the satellite operator as he knows what promises he has made to his customers about deletion, might be even a regulation issue (GDPR) and it is also about the technical competence of the satellite operator (Some might need a longer period to safeguard their data).