It's up to your personal preference. Some people prefer to peel the potatoes before boiling them, while others leave the skins on for added texture and nutrients. I like to scrub and cook them with the skins on. Not only does this make peeling them easier, but it also ensures that you won't lose as much of the potato as you would if you removed the skins raw. It typically takes around 15-20 minutes to cook the potatoes until they are tender, depending on the size of the potato.