What is the average duration of doctorate degrees offered in U.S. schools?

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Doctorate degrees are widely considered to be the most advanced qualification offered in any field of education in the U.S. These degrees are generally considered to be suitable for individuals wishing to take up teaching as a profession, and can usually be acquired in a period of five years. However, students who are not able to complete their doctorate programs can take two years of extra time to work on their thesis.