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.
To reschedule, you must: 1  Choose a date within one year of your original test date. The GRE uses a 365-day rolling period. 2  Pay a $50 rescheduling fee (more on this in the next section). 3  Submit your request no later than four days prior to your test appointment (10 days prior for China).