I, usually, look for best deal on 10 packs of strings and buy 10 or more packs at once. The strings I buy have each set wrapped in, what appears to be, air tight "plastic." How long, approximately, will these individually wrapped sets be good? I know there are variables like humidity and temperature but say - stored in a controlled environment room with guitars? I would be interested in your thoughts on both Acoustic and Electric strings. My string brands are D'Addario, Elixir, and Ernie Ball (electric).