Amount of Time Needed for a Ph.D. in Nursing. Earning a Ph.D. in Nursing can take from four to six years. The degree program requires a significant time commitment on the part of the student.Students can expect to engage in full-time study, including classes in the summer.octor of Nursing Philosophy. Doctor of Nursing Philosophy programs require four to six years to complete. This research-based doctorate program requires that students prepare a dissertation consisting of original research that will advance healthcare delivery systems and nursing practice.