Depends on how it is patched. If it is done correctly, should be find.
If EPDM roof, I'd cut out a patch that overlaps the "hole" by several inches, bond it with industrial adhesive, and then eternabond the seam.
If the roof is already patched 6 inches, consider the roof totalled and subtract 6-8 thousand dollars off book value to ensure you are getting a good deal. Per my insurance adjuster, any tear larger than a silver dollar is sufficient to total the roof as a loss.
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