How many years = indefinitely?

Well , first off; what the heck is spam anyhow...LOL Secondly, I just read a story of a Vietnam veteran who just opened a MRE from the Vietnam conflict. Pound cake was his favorite, so he saved an MRE with pound cake for his retirement celebration. He just opened last week and it was fine. That spam would make a great last meal for yourself on your death bed. Enjoy! Have a wonderful spam filled life!