re: How long needed to study for the GRE?

It all depends on what you're going for.

Some people are going for 700+ on both sections. That will require studying for just about anyone, especially for verbal since there is a lot of vocab related stuff. And on math, if you didn't take any math since high school and have 3-4 years of work experience, I imagine you'll need to brush up since you're 8 years removed from the types of questions that are asked.

For me the math was super easy to prepare for, but that's because I wasn't 8 years removed from solving those types of questions.

I realize I am using the old scoring system. I took the test 5 years ago back when it was 1-5 for writing and 200-800 for verbal and quant.