Disseration writing is the most difficult academic paper to write. A person has to come up with their hypothesis and set out to prove it through research.
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It varies, though a minimum of 60 is fairly typical. However, unlike an undergraduate degree, a Ph.D. is not automatically awarded upon the completion of a particular set of courses. The candidate must perform a substantial body of independent research, write up the results, and then defend his work before a committee.
AnswerIt takes usually between 2.5 and 5 years.The PhD would take approximately four years post bachelor's to complete. The actual length of time depends much on how long it takes a student to prepare and defend their dissertation, which is an individual project on a topic of the students choosing with extensive research from an original view point and approved by a designated committee.