Welcome to GMAT Club.
We have the 13 Week study plan that GMAT Ninja is about to finish publishing:
https://gmatclub.com/forum/gmat-ninja-s ... 00295.htmlYou can check my "rough" study plan here:
https://gmatclub.com/forum/the-definiti ... 17827.htmlI studied about 2 hrs/day (studying) but also spent another 1-2 hrs per day just reading English Fiction to get my mind to be more used to dense reading passages and help improve my English skills (something you may not need as much if you are a native English speaker).
I would add that you may want to consider your starting point. You may not need such as long haul since you are looking to improve 50-80 points. Not the easiest end of the spectrum to improve on but definitely better than starting out at 500. It seems you may not need as much focus and effort. I generally recommend planning to take the test within 3 or 3.5 months. The issue is not burn out (which is an issue in itself) but rather forgetting all that you need to remember. Stretching it all out causes losing momentum/etc.
Finally, would decide on what you want to use to prep - are you an online course person, a live course person or a books person? What helps you study best and helps you perform best? I knew I was a book guy so I stuck with books but some courses do adapt and help you cover the material that you need rather than everything in the book so there are benefits. My issue was being passive while doing a course and not being able to lock myself in a room and focus on the material 🤷♂️