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 now and then. GRE is a computer based test (CBT) and it is offered on most weekdays and weekends all over the world, but for those countries where there is no availability of a CBT, a paper based test is conducted up to 3 times a year.