A month. The mountain climbing certificate has an exam every month. The issuing authority is the Emergency Management Bureau (formerly the Safety Supervision Bureau). The certificate is reviewed every three years and renewed every six years. After registration, the school will organize training and examination in a unified way. One month after passing the theoretical and practical results, the issuing authority will collect evidence. Climbing certificate, also known as aerial work certificate, is a special work certificate that must be obtained by personnel engaged in climbing erection or aerial installation, maintenance and demolition.