Some people literally study for a month or so a few hours a day and get 35+. Others study for 3+ months and scrape out a 25. It totally depends on how comfortable you already are with the material and how smart you are.
Honestly though, 7 hours a day of MCAT study for a summer sounds disgusting. With your original schedule, do you like, not have a social life? Or an SO? Or any friends? Or any hobbies outside of work/MCAT? Because you seem to make zero time for any of that. And that's not healthy - you'll burn out so fast you'll just stop studying altogether. It happened to me a few times when I tried to study that much. I don't think I ever really studied more than 4-5 hours in a day, and I'm about to take the test this Thursday.
For me, 3-4 hr a day (with some days off) was a lot more manageable. As far as the class goes, it's really your call. A nice thing about the course is that it keeps you focused and forces you to learn the material, or at least be exposed to it. I've found that it's easy with self-study to get stuck on a certain topic you don't understand well and just swirl around, eventually getting discouraged and stopping altogether.
However, I didn't take the class, and I didn't exactly follow SN2ed's method. I bought the BR books and the EK set, carefully worked through each chapter (switching subjects each day), then once I got through all the material I started a massive review for a month while talking full length exams (only four, but I'm getting very consistent scores I'm happy with). The whole process took about four months. While SN2 provides a great study schedule, I've found that some in this forum get obsessed with following it to the dot, and while it's great that that works for them, I really wasn't interested in letting a suggested schedule dictate my life to me.
