How should synthesized DNA be stored?

The dried product is very stable and can be stored at -20°C for 2 years without issue.Dissolved DNA should also be stored at -20°C, preferably aliquoted to avoid repeated freeze-thaw cycles. Oligo DNA in solution should be fine at room temperature for 3–4 days, but it is best not to leave it for more than a week. Its longevity is related to container and solvent sterility.