Many corrosion models are not time-variant. Eg Eyring and Arrhenius models

It's not the salt alone as far as I understand. It's the salt, the moisture, the dirt, the micro damages/cracks, temperature changes all working together to foster starting points for corrosion on surfaces or crevices. Leaving all this on does give it time to work. Regular washing dies remove some of the culprits (salt, dirt,...) thus reducing the attack vector on the surface. Wax might even add some protection. (I read the "time is not the issue" comment but am not sure how to understand it, surely time plays some role in it, else the corrosion should start immediately at contact with salt?)