Catastrophe definition, a sudden and widespread disaster: the catastrophe of war. See more.
1 Total Time: The computer-delivered GRE takes 3 hours and 45 minutes for the average student.  Experts recommend sitting for the GRE exam one year prior to entering graduate school. This allows for ample study time and the option to retake it if desired.
What is GRE? The GRE or Graduate Record Exam is required for admission to most U.S., Canadian, and UK graduate schools. Most students attend graduate business school for pursuing an Master degree. In addition, GRE can also be used for admission to PhD program.