The duration for implementing ISO 9001 will vary from company to company, but company size is often a big predictor of the time it will take to implement ISO 9001:2015. For a small organization (up to 10 employees), implementation could take between 3 and 6 months. For a medium-sized organization (10-100 employees), implementation could take between 6 and 12 months . However, there is no one-size-fits-all answer to the question of how long it will take to develop and implement an ISO 9001 quality management system.