20 or 30 hours. According to "Regulations on the Administration of Highway Transportation in People's Republic of China (PRC)", highway and waterway test and inspection personnel must complete 20 hours or 30 hours of continuing education every two years during their tenure. Water transport test inspector refers to a professional with water transport test skills, education, practice and professional level. They are responsible for testing the quality and performance of goods and ships in the port channel to ensure public safety and shipping safety.