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I used to work with a brilliant and humble guy. He got accepted to MIT at 14, but his parents made him go to community college for a year to give him a little more time to mature. He then went to MIT and graduated after three years, then went to Berkeley and got a masters in one year, then went to Stanford and it took six years to get his PhD? Why? Because his advisor milked him for his work. She had a pile of papers to peer review ... hand it off to the grad studends. Have a talk to give? Give the grad students the task for writing up first drafts, collecting data, generating graphs etc. My friend said that nothing in the first five years of his PhD work contributed to his dissertation. I'm amazed that behavior like that of the advisor is allowed. |
Yes, it is possible to complete a PhD in 3-4 years, but it's not really good for your career. The bar our department sets for a PhD is that at the end of it, you should be a world expert in your specific topic.
A PhD is more like an apprenticeship, where you develop and refine your skills, your background knowledge in your area of specialization, your ability to write and do presentations, and your taste in research problems. These are all things take a lot of time to mature.
The problem with graduating fast is that (a) you wouldn't be able to do internships, (b) you would severely limit your ability to grow your social network (via workshops, conferences, internships, department service, etc), (c) you would limit your ability to deepen and broaden your portfolio of research, and (d) you limit the time your ideas have to percolate out into the rest of the research community and industry.
While I can't speak directly about your friend's experiences, learning how to do peer review and learning how to write first drafts are really important skills that can indirectly help with coming up and executing on a dissertation idea.