24 hours. Except for coal mines, non-coal mines, dangerous chemicals, fireworks and firecrackers and other high-risk industries, the total training time of pre-job safety education at all levels shall not be less than 72 hours, and all other industries shall not be less than 24 hours. The safety training duration of the pre-job three-level safety training shall not be less than 24 hours. The contents include professional knowledge training, safety awareness education, risk identification and evaluation, emergency rescue training, etc.