How well it holds up is all about the prep work and the exterior coat. If you half @ss the prep, the film won't bond well, and it'll rub off in days or weeks. If your applicator does a proper prep job and they run a proper clearcoat on top, it can be as close to "permanent" as it can get.
I built my own hydrographics shop several years ago - don't waste your time - pay someone qualified to do it for you, you'll be money ahead, and have better quality finished products.