Hey tentwentykat,
I was in a somewhat similar situation. I took the September MCAT last year, and started review in mid to late May. I was in a research lab full time while studying for the MCAT as well. I am still in school however, so the content was fresher in my mind and I probably needed a little less content review than someone who has been out for 2 years.
I would suggest trying to find an activity you can do to de-stress for half and hour to an hour every day to try to prevent burnout. I was in lab from 9am-6pm most days, went home and made food, then studied 8pm until 10pm or midnight most days at the beginning, and I crashed hard and burnt out towards the beginning of July and basically took a week and a half off of studying. I then went back to studying, but kept around an hour a day to watch Netflix, Youtube, or play video games with friends to keep a sustainable pace, even if I hadn't finished my chapter for the day. I also cut down on studying on weekends from 8-9 hours a day to about 5, and tried to hang out with friends or at least get out of my apartment. For me, quality of studying (i.e. not burned out) worked better than sheer quantity in this regard. Note that with this method I was only reaching about ~25 hours of content review a week, which may be less than what you want. I then transitioned to practice tests in August, which gave me a lot more time on my hands, especially as the school year started up.
A few disclaimers, the content was reasonably fresh in my mind as I had taken a lot of MCAT related courses the previous semester. Also I don't need large amounts of entertainment to keep me sane, I'm not sure if 0.5-1 hours a day of break time will help you as much as it did for me. Recuperating on the weekends also was a big help for me.
A few questions, is there a particular reason why late July/early August would work best for you (i.e. applying this cycle or anything like that)? Also, do you study or work on weekends, or take them off?
Edit: I also used a all-in-one review book (it worked for me but I'm not sure if it is the greatest idea overall) so I had less content to review than if I used a box set as well, which is one reason reduced hours didn't majorly affect my overall plan