Pretty much impossible to predict. I think you absolutely could reach the 720 range, but your Quant could hold you back. As you'll see many on here say, it's not about how much you study, but really, how effectively you do so.
I know a bunch of people who studied a lot more than me (not to say I didn't study a lot...) that did not improve nearly as much because their methods were flawed. The obvious, most common type is the style of just doing problems without learning the underlying concepts. To do well, you have to learn the concepts, especially if you are not naturally strong in math.
I would get the Manhattan GMAT books (or somethiing else, those are just what I and many others used), and plow through them. As you finish each one, do the associated Official Guide problems that the book tells you to do. Spend as much time as necessary to rework and study the answers to both the one's you got wrong (obviously) and the ones you got right, since you may not have used the easiest or most time effective method. Personally, I would not worry about timing at this point, but simply work on getting every concept to "click".
Also, don't neglect verbal. You seem to be pretty strong naturally in Verbal, but I would do a concept by concept breakdown for this as well. Maybe go a little bit quicker than you do with math, but you probably will be looking to make up for a slightly lower percentile quant score with a very high verbal. You could definitely get in the 44+ range, which will really give you some leeway with Quant.
Once you have gone through all the concepts, take a practice test. You should have a pretty good feel by this time what you're good at and what you're not. Use the next few weeks to redo any strategy guide/OG problems you had issues with. I would start sitting for tests each week to continue to give yourself real assessments of strengths and weaknesses, and to start to develop some timing skills.
Most Important : Once you have been through everything, it is up to you to determine how much you improve. At first, I found studying to be easy, because it was simply plow through tons of material. After that though, you really have to test your mental toughness and continue to focus on those weaknesses, no matter how little fun it is. Every test should be reworked multiple times to make sure you have error concepts down. Every wrong problem in the OG should be reworked. Never settle for half understanding. I honestly believe this is where most people fail in their studying. They are simply unable or unwilling to put themselves through the pain of looking at their weaknesses over and over, but it will pay off.
Last, I would create a timeline, and try your best to stick to it. Set your test date, create a calendar, and ~10 weeks should be more than enough to get the score you want. If you have to retake when the test changes, not that big of a deal I don't think.
Good luck. check out my debrief if you want some more of my strategies.
