However, most people spend between one and three months studying a few hours a week for GRE. This means that the number of studies for GRE could range from approximately eight hours (studying two hours a week for four weeks) to 120 hours (studying ten hours a week for 12 weeks). Taking into account all the points we have mentioned, the GRE preparation will take between 4 and 20 weeks. If you include the mock tests you would have to perform, the preparation time can range from a minimum of 6 weeks to a maximum of 24 weeks.
Instead, separate the weeks and make it possible to study at least 2 hours each day of the week. Even every other day is better than putting all your study hours into one or two days. This answer depends on your goal scores and how far you are from those scores. In any case, you should not spend less than 2 weeks studying for the GRE and you are likely to achieve diminishing returns after 6 months of study.
Ideally, you should spend 1 month to 5 months studying.