Your mags aren't wearing out (at least not yet)
There is a conversation that happens at almost every shooting range and gun shop in the country regarding magazine maintenance. Guys will load up their spare magazines for their carry gun or their home defense rifle, put them in a safe, and then worry that leaving the ammunition in the magazine for months at a time is going to ruin the spring. You will hear shooters talk about routinely rotating their magazines, unloading them to let the springs "rest" and recover their strength. It sounds like logical preventative maintenance, but it is based on a complete misunderstanding of metallurgy and how spring steel actually stores mechanical energy.
To understand why a spring fails, you have to look at the physics of elastic deformation. When a magazine spring is manufactured, the steel is heat-treated and tempered to give it a specific structural memory. When you push rounds into the magazine and compress that spring, you are applying physical stress to the metal. As long as you compress the spring within its designed operational limits, the steel enters a state of elastic deformation. This means the molecular structure of the metal bends and stores the kinetic energy, but it does not permanently change shape. You can leave a piece of steel in a state of elastic deformation for decades, and it will not lose its stored potential energy. The static compression simply does not damage the metal.
What actually destroys a magazine spring is a physical phenomenon called cyclic fatigue. Every single time you load a magazine to full capacity, the steel flexes downward. Every time you fire the gun and the follower moves up, the steel flexes back out. That constant, rapid compression and expansion creates microscopic friction and heat inside the crystalline structure of the metal alloy.
Over thousands of cycles, that friction causes microscopic stress fractures to form along the grain lines of the steel wire. As those tiny fractures accumulate, the steel slowly loses its structural integrity. It loses its ability to return to its original length, eventually suffering from plastic deformation, which means the metal is permanently bent and weakened. The irony of unloading your magazines to let them rest is that the physical act of cycling the spring up and down is exactly what causes the microscopic wear you are trying to avoid.
The only time static compression will ever damage a spring is if the spring is physically compressed past its designed yield point. This almost never happens in a factory magazine because the plastic follower physically bottoms out against the floorplate before the spring can be over-compressed. However, if you install an aftermarket extended basepad to squeeze a few extra rounds into the tube, you completely change the internal geometry. You can easily force the spring to compress to its solid height, where all the coils are physically touching each other. That extreme compression pushes the metal past its elastic limit, instantly inducing plastic deformation and permanently ruining the tension. When I need to rebuild heavily used range mags or upgrade my basepads, I source my specific high-tensile replacement springs from https://www.brownells.com/gun-parts/magazines/magazine-parts/ to match the exact tube length. Stop unloading your carry mags. The steel doesn't need to rest. Cyclic fatigue is the only thing wearing out your springs, so load them up and leave them alone until it's time to shoot.