10 to 20 minutes. Dandelion has high medicinal value and has the effect of clearing away heat and toxic materials. Boiling water can improve sore throat or aphtha and reduce internal heat. It should be noted that although the cooking time can be adjusted slightly flexibly, it should not be too long, so as not to destroy the nutrients in dried dandelion. If it is cooked for too long, it may lead to a decline in efficacy. Therefore, it is suggested to boil water for 10 ~ 15 minutes, which can not only ensure the efficacy of dandelion, but also avoid the loss of nutrients. In addition, dandelion is a kind of traditional Chinese medicine with light texture, and the effective components of the medicine are easy to precipitate, so it doesn't take too long to decoct. At the same time, the temperature of dandelion boiling water can also be adjusted according to personal conditions. If you like hot water, you can cook it for a long time. If you like to drink something hotter, you can shorten the cooking time. In short, the cooking time of dried dandelion depends on personal preference and specific conditions, but generally it should not exceed 30 minutes, so as not to destroy the nutritional components and efficacy. At the same time, we should also pay attention to moderate drinking, not excessive drinking, so as not to have adverse effects on the body.