A doctoral degree is an advanced graduate degree that typically follows a bachelor’s or master’s degree. In many fields, a doctoral degree is considered a “terminal degree”, the highest academic degree in a given field of study. Unlike bachelor’s and master’s degrees that can be completed on a part-time basis, doctoral degrees are work-intensive and usually require full-time attention (. 40 to 60 hours a week of studying). Most doctoral degrees are research-oriented and are earned under the supervision and tutelage of a professor.