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Keeping a spring compressed doesn't wear a spring. Cycling the spring is what wears a spring. Contantly loading and unloading is harder on springs than keeping them loaded.
Magazine designs vary, but I haven't needed to change mag springs on my competition 1911's until past the 10,000 round mark (with a buffer I don't bother changing recoil springs either until they start to ftf....which is at least 10,000 rounds).
If you changed springs say every 1-3 years most shooters would be well inside a margin of safety from my experience.
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