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Science wins out for me.
So long as a spring remains static within its design limits (Neither compressed or stretched beyond the amounts it was designed for) it will not lose strength.
Only cycling, or some oddity such as rust or extreme heat, can wear out a spring.
One more time. You can leave a magazine fully loaded for 100 years and the spring will be no weaker than when you loaded it. Repeatedly cycling a spring from its design compression limit to an unloaded state will wear it out after enough cycles.
I replace the main spring in my semi-auto weapons and the springs in the magazines every 2,000 rounds without regard to time or to whether they were left compressed or uncompressed, and that method is correct unless the gun manufacturer calls for fewer cycles before replacing.
I'm runnin with this. Empty magazines make me sad...