Preparing for a Ph.D. qualifying exam varies significantly by school and program. The preparation time can range from a few weeks to several months, with some candidates taking a month off from research to study full-time. The exam itself can be structured over multiple days, with formats including blocks of questions such as 4 questions over 4 hours on one day, 8 questions over 8 hours on another, and additional questions on subsequent days. Success rates hover around 60%, emphasizing the importance of thorough preparation. Candidates often dedicate extensive time to study, sometimes up to 10 hours a day, to ensure they pass on the first attempt, as retaking the exam can be stressful.