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To be clear, when I said earlier that my magazines stay loaded, I also meant that I have a round chambered and my M&P is ready to fire. It stays in this condition with only short breaks for cleaning. Three years, 5000+ rounds. Yes, metals can change over time. However, the springs in a modern autoloader will last long enough that most of us will not see the difference. There are exceptions, of course. Contact your pistol's manufacturer if you have questions.

My 5 S&W magazines for my M&P9 M2.0 5inch stay loaded. The magazines cycle during practice and training. So, for the last 3 years, these magazines have been loaded and cycled.