Regarding the timings for the Graduate Record Examination in India, the whole system of taking it is quite flexible. The concerned authorities of the GRE General Test have formulated the program. To take the exam, the officials have arranged for a system. This system contains that the GRE aspirant can take the computer-delivered test for one time in every 21 days. Also, a candidate can take the exam five times a year from the date he/she first took the test.
This condition also affects the candidates who have canceled the scores of the test, taken earlier. This translates to your year being counted, even if you have dropped your scores of a test taken on that date. Quite noticeably, a GRE aspirant has the greatest freedom in the offline (pen and paper-based) mode. Such a candidate can take the test, for as many times as the authorities offer it, in a year.
Talking of the duration of the exam that spreads on a single day, it takes 3 hours and 45 minutes. The authorities conducted the exam either in the session of morning or noon. Hence, have a happy time preparing for GRE!