Inspired by the post about extracting pet DNA, how long would genomic DNA be stable for in a -20°C freezer? It is common practice to store DNA (double-stranded, plasmid) in a -20°C freezer in the lab, but would genomic DNA last longer in a -80°C freezer? With either method, how long would it be stable for?
If the DNA is pure, it should last quite a long time. If there are enzymes and other biological molecules in there, -80C will work much better.
I think you could keep pure DNA at -20C practically indefinitely.
Purity is the main issue there, also pH stabilized, sealed properly, etc. That makes all the difference.