My understanding is at least 1 year, because in the cycle of 1 year, the terms required by the system will be implemented, especially some annual activities, such as internal audit and management review. 2. If it is upgraded from 2008 to 20 15, it will take at least 3 months. In order to promote the healthy and orderly development of management system certification consulting industry and continuously improve the effectiveness of certification consulting work. Guide certification consulting institutions to establish a self-discipline mechanism and provide standardized consulting services; Guide the institutions receiving consulting services to reasonably select certification consulting institutions and supervise the quality of consulting services. According to the Articles of Association of China Certification and Accreditation Association and the China Convention on Self-discipline of Certification and Accreditation Industry, this specification is formulated.