You need energy to produce a force that compensates gravity. So if you apply that force for a huge amount of time, will gravity ever be depleted?
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Applying a force only requires energy if that force moves something (or at least pushes along the way something is moving). Think of setting a mousetrap. The spring will be applying a force on the bar, but until the trap is triggered, the bar will stay held in place. It can stay like that forever; there’s no battery to recharge or key to wind until the bar is actually released. Then, since the spring is *moving* the bar, the spring’s energy is released.
Same thing with gravity. Gravity might be pulling on a rock, but unless the rock is moving up or down, no energy is being stored or released by gravity.
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