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The time actually worked between the regular start and end times of work on prescribed working days as stipulated in the company's employment rules, collective bargaining agreements, etc. However, it must be within the statutory standard working hours (daily working hours: 8 hours for general workers under Article 50 of the Labor Standards Act, 6 hours for workers engaged in hazardous operations under Article 46 of the Occupational Safety and Health Act, 7 hours for young workers under Article 69 of the Labor Standards Act).
When calculating the total for 1 month, if there are units less than 1 hour, round up 30 minutes or more and truncate less than 30 minutes.