The time it takes to cook rare rice depends on the specific cooking method and the intensity of the heat. Usually, rice and the right amount of water are placed in a pot, heated to a boil, and then turned down to a low heat to cook slowly. On medium-low heat, it takes about 20-30 minutes to cook thin rice. The cooking time also varies depending on the variety of rice, the amount of water and the characteristics of the pot. During the cooking process, it is best to observe and adjust accordingly to ensure that the rice is cooked and achieves the desired thin rice texture.