Unclear with what shrinking does in cloth property weights

Shrinking has always been in the past few versions of blender, but im not too sure with how it works even with tutorials as they mostly just say “This shrinks the cloth” or something to that degree.

When you use this (in 2.82) does the cloth constantly keep shrinking at the rate you have set it? Do you need to set a keyframe for it to stop? Or it is more like a percent as in it will be 0.5 smaller and then stop once the desired size goal is met?