By definition, a "clip" doesn't have a spring. The term you're looking for is "magazine". With that said,
Don't worry Jeff, we knew what you meant.
I posed the same question to an armorer and was told that all springs, including the ones in spring fed magazines should not need changing under "normal" usage. Define Normal. But all springs are maintenance items and need to be checked when you clean your weapon. Use a magnifying glass or a real young set of eyes and look for signs of stress and cracking. I had to replace a magazine spring in one of my magazine after it developed what looked like fractures in the material where it made a tight 90 degree bend at the follower attachment point.
It's all part of maintenance. Even weapons kept in storage need to come out and get a good 'goin over' on a periodic basis.