The image stability depends on the storage of the picture. Heat, humidity and direct light over an extended time period speed deterioration.
However, if stored and handled properly, Impossible photographs will last for many years. To maximize the stability of any photograph, it should be stored in a cool, dry place, without direct exposure to sunlight or fluorescent lighting.
Do not expose the fully developed images to extreme humidity, direct sunlight or high temperatures for an extended time period, as this may cause alterations in color or fading of the image.