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Doctor of Mechanical Engineering in Harbin Institute of Technology for several years.
Doctors have many uncertainties, usually 3 to 5 years, with an average of 4 years.

The specific reasons are as follows:

1. Doctoral graduation is different from undergraduate and master's degrees. Doctoral students can't graduate just by meeting the time requirements, and there are many uncertain factors that affect doctoral graduation.

2. The requirements for doctoral students in the Department of Mechanical Engineering of Harbin Institute of Technology to complete graduation are: they must have rigorous scientific research results and have published papers in authoritative journals.