According to China's Regulations on Safety Management of Hazardous Chemicals, the training time for hazardous chemicals practitioners is not less than 24 hours. These training courses include the basic knowledge of hazardous chemicals, safe operation procedures, emergency handling of accidents, etc. The purpose of training is to ensure that employees have the necessary safety awareness and operational skills, can correctly handle dangerous chemicals, prevent accidents, and take appropriate emergency measures when accidents occur. The specific arrangement of training time will vary according to the region and specific requirements, but the overall requirement is not less than 24 hours.