Firstly, we examined the factors that influence graduate students’ learning outcomes from the viewpoint of study time. Secondly, we scrutinized the effect on study time via undergraduate school learning, part-time work, and interactive class experiences. We randomly selected graduate schools and conducted a questionnaire survey in November 2011, targeting 783 students in 31 graduate schools. The results indicate that students who made gains have serious learning behavior such as participating in class, as well as self-learning to enrich their knowledge. It is important for faculty members, as tutors, to confirm the course plan before completing registration so that students can work on self-learning without overdoing it. Moreover, self-learning is influenced by one’s enthusiasm for liberal arts and specialized subjects during one’s undergraduate period, but self-learning is also influenced by part-time work and interactive class experiences.