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.
This information can help you determine your strengths and weaknesses on the GRE, which is especially useful if you choose to retake the exam. The GRE Diagnostic Service is available beginning four days after your official scores become available, and you can access it up to six months after your exam date.