So some knocks out the image 00.01 sunday with the result that no one notices before 00.01 monday and image gets deleted when it should not have been. No 7 days means it is generaly fairly safe to assume that any contrivery will be mentioned on the page or is all over.
And for those 7 days we are breaking the law. Copyright violation is illegal, and having an unlicensed image on Wikipedia without it being acceptable under fair use (and if it isn't used on any pages, then it isn't acceptable under fair use) is copyright violation.
IANAL, but I think we can justify 24 hours of violation while we work out what we should do, I don't think we can justify 7 days. Not when it is so easy to undo a deletion.