The time it takes to cook rice in a rice cooker depends on a number of factors, such as the power of the rice cooker, the cooking mode, the amount of rice and water, the temperature of the water, and whether or not the rice has been soaked in advance. Usually, it takes 15 to 20 minutes to cook rice in a rice cooker.

Rice cookers with more power may take less time to cook. Also, if you choose the fine cooking mode, the cooking time may be slightly longer, but usually not more than 50 minutes. The fast cooking mode, on the other hand, is usually around half an hour. If the rice has been soaked in advance and hot water is used, the cooking time can be further reduced, sometimes as short as 20 minutes.

Overall, the cooking time of a rice cooker is not a fixed value, but is influenced by a number of factors. Therefore, it is recommended to choose the appropriate cooking mode and time according to the specific situation. For the most accurate information, you can refer to the instruction manual of the rice cooker or contact the manufacturer of the rice cooker for advice.