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Physics tell us that springs wear out from being cycled (compressed and uncompressed repeatedly), NOT by staying compressed. People have dug up Colt 1911 magazines left loaded since the First World War and the springs still function fine today.
Now, here's the caveat. Real firearm springs are nearly always high quality spring steel and have far more engineering put into them. I HAVE seen airsoft springs take a set from compression probably because the steel (?) used in them is of inferior quality. Mag springs aren't typically found as spare parts which means a worn out one usually necessitates a brand new mag. If you have the opportunity to ease the tension on your mag springs then go for it, but don't think you're going to ruin your mag by leaving BBs in it for a few weeks.
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