This is the wrong question my friend. It is not a question of hours.
Were it only a question of hours, many takers would be scoring in the 99th percentile. Well, that's technically wrong, but the spirit of the statement is that hours never ever equal resulting score. I can point you to posts by students who have slaved for 10-12 hours a day for 3 or 4 months and yet failed to break 500. I can also point you to posts by others who studied for the MCAT while also attending classes, limited to 10-12 hours of real MCAT studying per week for 3-4 months and easily scored >510.
The MCAT2015 is far less focused on nitty-gritty detail recall, however it is still important if you are aiming to score in the 90th percentile (512+) and I believe that for most individuals, it is still needed to have a deep, SN2ed-type content review combining practice passages and discretes using in-depth materials like TBR to attain a score like that.
However, if you will be satisfied by, say, a 505-510, I would still utilize a SN2ed but use less in-depth materials like EK/Kaplan/TPR without use of discretes.
In general, here are my keys for success:
--Go back to the source: Read the SN2ed material. Despite designed for pre-2015 MCAT, much of the advice and knowledge still applies. Not just in terms of material selection and schedule creation, but also the importance of subject rotation, error logs and a deep review process of practice items.
--Check on modern versions: KoalaT and MCATjelly are great places to start. Making your own schedule is invaluable, so you can easily adjust if something happens.
--Search The Golden Rule: Simply put, "wrong is wrong, least wrong is correct." While this was written by KoalaT to boost CARS scores, it can be applicable to other subjects as well. It is along the lines of what cjohns89 wrote above, but KoalaT goes into more detail
--AAMC FLs are imperative. Use the Sample Exam at the beginning, to get a feel for what the MCAT should be like. Use FL 3 halfway through your review, FL 1 and 2 in the last two weeks on whatever your test day is (Fri, Sat, etc).
--Non-official FLs: Stay far away from TPR/Kaplan unless you are using them merely as practice passages. They are usually discouraging because they give a deflated score. The consensus on best third-party FLs is that NextStep and Altius are the best are imitating the actual MCAT both in questions and difficulty.
--Study without distraction: deactivate all social media until your actual MCAT. lock your phone and internet during study hours
--Best mind via best body: eat right, sleep right, exercise right, cut back on caffeine and alcohol. Take care of your body and it will take care of your mind.
I've written other lengthy posts, if you would like to search for them. The Strategies sticky is highly important of course, and the 509+ habits thread too.
Best of luck!