The length of the PhD course is determined by the institution, country and research field you select. In general, it takes between 3 and 6 years to complete a PhD. In India the majority of universities require at minimum 3 years of study after earning the master's degree. However, it may be extended depending on your thesis's progress and the research's complexity. Certain students fi... https://www.aimlay.com/phd-course-duration-india-usa-us-iit/