Longevity depends in many ways to the quality and use of materials but also to humidity, temperature, exposure, etc. While most people take from granted that acrylic or oil on canvas will have a long life, the truth is that all depends on the quality of the materials used. Low quality fabrics and paints lead to a series of problems that make art restoration, a booming business. Digital paper and inks are often subject to what the industry call "age acceleration" that consist in exposure to intense heat and light. So far Epson has the longest life span with around 100 years if the print is shown behind UV protected glass in a bright-office like-well lit room. I won't be there to make good on my guarantee by I can tell you I use the most archival ink and paper the market offers today. I had researched the industry and I have the assurance from prestigious scientists and testing facilities that due to my innovative process the longevity of my works will improve many times over.When printing a photograph, the heads of your printer coats the very top layer of your paper with a very thin mist of ink. The least used ink the better as long as the image show the true colors and density. Saving ink is one of the main priorities for printers manufacturers. This thin layer when exposed to light and climate will start to gradually fade after 75-100 years according to Epson. In my process, according to Douglas W. Nishimura, Senior Research Scientist at the Image Permanence Institute, Rochester Institute of Technology. "Assuming that you've made your coating so thick that adding more won't change the appearance you've essentially saturated the effect of the ink on light, then you've probably got enough redundant ink laying down to reduce the problem of fading due to light or atmospheric pollutants". Jose Tonito