"Fifteen minutes or so. Luffa is an easy food to cook. Generally speaking, it can be cooked thoroughly by cutting it into pieces and boiling it in water for about fifteen minutes. Usually it can be served when it is soft and slippery. Many people want to pursue the soft and rotten taste of loofah, but if the loofah is cooked for too long, the internal nutrition is easy to be lost, so from the nutritional value, cooking for about 15 minutes is almost the same.