Graduate students preparing for thesis defenses often seek insights into the experience, particularly the intensity of the process. The preliminary oral exam is typically considered more challenging than the defense itself, as it tests a candidate's general knowledge against that of more experienced examiners. During a defense, candidates usually present their thesis and respond to questions, ideally demonstrating a deeper understanding of their topic than the committee. Preparation with a thesis advisor is crucial. Candidates share experiences of unexpected questions during preliminaries, emphasizing the importance of knowing one's limits and avoiding open-ended invitations for questions. The discussion highlights that failing an oral exam can be a significant concern, but students generally have the opportunity to retake it. The overall sentiment reflects the high stakes and rigorous nature of graduate education, with a typical defense lasting around three hours.