As long as you can handle the fact that it will get nicks and scratches on it over a couple years, it is perfectly capable of handling the world naked. Mine is naked right now while I wait for my grove case to come in, it's fine.
More like a couple of weeks in my experience. Mine got a small silvery ding at the back near the corner. It's small, but it's shiny.
I finally put a case on it - to hide the shiny ding.