The main thing that really wears springs out is the action of compressing and releasing, if there is no tension for long periods of time, or it is fully compressed for long periods the result will be the same.
Hanzo nailed it. You can do a search on this matter. It is the constant action of compressing and decompressing the spring that wears it out. I leave mine fully loaded. There have been mags loaded from WWII and the springs were just fine 60 years later.
I would think that would take years......some rotate magazines every few months to avoid such problems real or imaginary. I would think being plastic new "Glock Perfection" extra mag should not be more then $15 (I'm being generous here).
Glock magazines are steel lined polymer with very well engineered followers and Swiss made springs that are arguably the finest pistol mag in history. Common prices are low to mid twenties.
Come to think of it made in Austria & Switzerland for < $30 isn't all that bad. Lets face it most of the rest are made of some kind of "sheet metal" and some go for $40 or more.
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