Shanghai Ocean University graduated from full-time doctor for 3 to 4 years. According to the regulations of Shanghai Ocean University, the training period of full-time doctoral students is 3 to 4 years. The specific graduation period depends on the subject field, research progress, personal situation and other factors. Generally speaking, doctoral students need to complete the tasks of degree courses, scientific research projects and thesis writing, and get a doctorate through defense. Degree courses generally take 1-2 years to complete, while scientific research projects and thesis writing take a long time. However, please note that this is only a rough time frame. Due to research progress, tutor's guidance, students' own ability and other factors, the actual training cycle may be different. I suggest you consult the relevant departments or tutors of Shanghai Ocean University for more accurate information.