It takes around 10 minutes to boil potatoes in a cooker. The time may vary depending on the size and type of potato. For example, waxy potatoes will take a little longer to cook than starchy potatoes. If you're boiling potatoes for a salad, you'll want to cook them until they're just tender so they don't fall apart when you're mixing everything together. If you're boiling potatoes for mashed potatoes, you'll want to cook them until they're very soft so they're easy to mash. To boil potatoes in a cooker, start by adding them to a pot of cold water. Bring the water to a boil over high heat, then reduce the heat to medium-low and let the potatoes simmer for 10 minutes. Drain the potatoes in a colander and let them cool for a few minutes before serving.