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.
Insufficient practice under exam conditions The timed GRE exam runs at least 3-1/2 hours. Needless to say, endurance plays a significant role in GRE testing. Condition yourself to go the distance by taking at least two or three full-length practice tests straight through, with only a few short breaks.