I recently received some blotters of a print called cartoon shiva. They're like 2mm x 2mm big if that, which kinda concerns me. They're supposed to be 100-120ug each. Anyway, I currently have the blotters wrapped in aluminum, inside the cap of a USB stick that snaps on and is fairly air tight I believe. On top of this they are in the freezer. How long should this keep the blotters active for?

