Three days. According to the clear regulations of the State Administration of Work Safety, the pre-job safety training time at all levels, the total pre-job safety education and training time at all levels other than high-risk industries such as coal mines, non-coal mines, dangerous chemicals and fireworks and firecrackers shall not be less than 72 hours, and all other industries shall not be less than 24 hours. Tianjin Branch of China Petrochemical Co., Ltd. and Tianjin Petrochemical Company of China Petrochemical Corporation are national super-large oil refining, ethylene, chemical and chemical fiber joint ventures under China Petrochemical Co., Ltd., which were established in 1988.