You can do graduation & Post Graduation in one year (Single Sitting) only.

The Ph.D. is a doctoral degree, distinctively called a "doctor of philosophy" degree.

This is dishonest  as a result of Doctor of Philosophy holders aren't essentially philosophers (unless they attained their degree in philosophy !). That said, Doctor of Philosophy recipients are able to interact in thought experiments, reason concerning issues, and solve issues in subtle ways that.
A Doctor of Philosophy (PhD, Ph.D., or DPhil; Latin Philosophiae Doctor) is the highest academic degree awarded by universities in most countries. Ph.D.s are awarded for programs across the whole breadth of academic fields. The completion of a Ph.D. is often a requirement for employment as a university professor, researcher, or scientist in many fields. Individuals who have earned a Doctor of Philosophy degree may, in most jurisdictions, use the title of "Doctor" (often abbreviated "Dr") or, in non-English speaking countries, variants such as "Dr. phil." with their name, and may use post-nominal letters such as "Ph.D.", "PhD" or "DPhil" (depending on the awarding institute).

Typically it needs many years of study on the far side the degree. the precise range of years varies by discipline and by student. Some students complete in four years and others take up to eight or a lot of years of study betting on the sector, the student's analysis topic, and therefore the student's skills.