Not necessarily!
Say I lose 3″ off my waist from waist training, and I’ve reached my goal of say a 26″ natural waist.
I may be inclined to wear a corset every so often to maintain my 26″ waist, or maybe I’ll be extra good with my diet & exercise so I don’t gain any weight back on my torso.
Or maybe I’ll do both!
Either way, some maintenance is needed, but you don’t have to wear your corset for hours on end once you reach your goal – at least from my experience.