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.
GRE test Dates: The computer-based GRE Test is offered year-round at Prometric test centers. You can take the GRE Test once every 21 days, up to five times within a 12-month period. This applies even if you canceled your scores on a test taken previously.