Lifespan of your typical Casiozen tupperware? What in the end does them in??

By Casiozen I mean the standard plastic analog sport Casio watch powered by Miyota movements, so we are not talking G-Shock here.

I own few models and I like them a lot, I find them light and incredibly practical for everyday outdoor use, the quality control absolutely excellent for the money (for example, in all of them the second hand aligns perfectly). For two models that I particularly enjoy wearing, I bought a handful of specimen for each one expecting not to last very long, boy I was…

Lifespan of your typical Casiozen tupperware? What in the end does them in??