Not less than 72 hours before taking up the post, and not less than 20 hours of retraining every year.

According to the Regulations on Safety Training of Production and Business Units, new employees of hazardous chemicals production and business units should receive pre-job safety training, and the time requirement should be no less than 72 hours. This is to ensure that new employees have enough safety knowledge and skills, can correctly operate dangerous chemicals and respond to emergencies. The Regulations also require that the annual retraining time should be no less than 20 hours. This is to maintain the safe operation of employees and update and improve the emergency handling ability of dangerous chemicals. Retraining can help employees understand the latest safety requirements, master new technologies and methods, and strengthen their understanding of the risks related to dangerous chemicals.