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.
Your Guide to Taking the GRE. Every year, nearly take the Graduate Record Examination (GRE) as a requirement for entry into graduate or business school. Administered by the Educational Testing Service (ETS), the GRE exam is designed to test for aptitude for study at the graduate level.