The way I do it, to prevent having to spend too much time checking to see if they are done yet, is as follows.
I put the raw pototoes into a pot of cold water. Then I put this on the stove until the water is bubbling and steaming. Then I switch off the stove and let the potatoes finish cooking on the after heat. After around a half hour, they are generally cooked enough, and I only had to keep an eye on them until the water started bubbling and steaming.
Leave the lid on the pot, while the potatoes are cooking on the afterheat, because the steam helps them cook faster.