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by neilc 5318 days ago
Your PhD really shouldn't take 6-7 years. Realistically, the Masters should cover all your course requirements so the incremental time should be 1-2 years.

At least for a CS PhD in the US, this is not the case: even if you enter with a Master's, finishing in 4 years is usually typical. Of course, it depends on the school, area of study, adviser, and the student.