How many days does it take for the skill level of coal mine to be trained from level 5 to level 4?
2 1 day. Within three years, the accumulated off-job training time for management personnel shall not be less than 30 days, for professional and technical personnel not less than 2 1 day, and for other employees not less than 12 days. In particular, the training and annual retraining of new employees should be off-the-job training, rather than training in the form of pre-class meetings or crowding out employees' normal rest time.