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.
Because the GRE General Test is a computer-adaptive test (CAT), you can take the exam at one of the testing centers at almost any time. Each test center has its own schedule of operation, but their available time slots can fill quickly (especially weekends).