Do you have stability data for genomic DNA isolated with the QIAamp DNA Blood Mini Kit?
FAQ ID -518

Yes. We have shown that DNA purified with the QIAamp DNA Blood Mini Kit is stable for at least 10 years at either 2–8ºC or –20ºC. However, our data indicates that DNA stability is dependent upon elution buffer used for storage. For detailed information on this stability study see the QIAGEN News Article for the first part of the study and then the continuing study data at the 10 year mark.