It depends on the amount of potatoes that you are cooking and the size of the chunks they're cut in. A 1/2 inch cubed potato should take no more than 15 minutes to boil, this is for 2 pounds of potatoes. The smaller the chunks, the faster they will cook. They are done when a fork can be inserted with little or no pressure.
Boiling potatoes will take about ten to fifteen minutes to cook. It will be based on the size of the potatoes. Place them in a pot and cover with water. Let them boil and use a fork after ten minutes to see if they are cooked and soft.
The amount of time required to boil potatoes depends on the size and cut. Potatoes that are boiled whole typically take 20-30 minutes. You can reduce the cooking time by cutting the potato into cubes, which usually cook in 10 minutes. To determine if your potato is thorough boiled, poke them gently with a fork. The fork will easily penetrate the potato when it is cooked completely through.