The time it takes to boil potatoes depends mainly on their size and whether they are whole or cut into pieces:

• Small or cubed potatoes usually take about 10 to 15 minutes to boil until tender.
• Larger whole potatoes generally take between 20 to 25 minutes.
• Extra-large potatoes (around 6 inches) may take 30 minutes or more.

You can test doneness by piercing the potatoes with a fork; if it slides in easily, the potatoes are done

. For best results, start potatoes in cold water, bring to a boil, then reduce to a simmer until tender. Adding salt to the water enhances flavor, and adding vinegar can help keep potatoes firm by inhibiting pectin breakdown

. In a pressure cooker, boiling potatoes typically takes about 2 whistles, which is roughly equivalent to 10-15 minutes depending on size

. In summary:

• Small/cubed potatoes: 10-15 minutes
• Medium/large whole potatoes: 20-25 minutes
• Extra-large potatoes: 30+ minutes

Check for fork tenderness to confirm they are fully cooked