From what I have gleaned, it seems the general consensus is you get out what you put in. For some students, 4 hours of studying is enough to completely understrand a subject. For others, they need 10 hours to understand the same thing.
The difficult thing with medical school is that there is just so much information and the more you study, there are diminishing real world returns.
If you are the kind of student who just 'gets it' you could likely comfortably only study 20 hours a week plus mandatory stuff and glean by with a decent Step score and pass your classes. That same student could probably put in 40 hours a week and perform top tier or 60 hours a week and achieve master status 550lb #gains. With the 20 hours, a 230 step would get them any non-competitive specialty. The 40 hours would get them anywhere and the 60 would just be to show off.
If you are the kind of student who needs to sit down and immerse yourself in the material to figure something out, that other student's 20 hours will likely be your 40, their 40 your 60 and so on.
If you are the kind of student who just naturally succeeds but isn't gunning for anything competitive, your proposed schedule may actually be too much studying. If they are gunning, then what you have proposed is perfect.
If you are the kind of student whose success is matched by their effort, what you have suggested is a likely perfect work/life balance but don't expect anything gunner-wise.
It really is so student specific, subject specific etc. Even some courses the workload varies greatly. Micro or GI will take tweice the effort as Cardiac stuff. Etc.