@Cat, you're so right. I should've repeated the section again. My bad. Thanks for the feedback.
@ George, from my own perspective, things like key signatures or rhythm patterns are not difficult to pick up by themselves since I do have several years of Piano playing experience.
It is quite a challenge for me, however, to control hand movements which are far more subtle here than on the keyboard. Infact right through D01-D03 I have been struggling to keep my right hand relaxed and avoid awkward movements.. and getting a clear melodic line from my rather weak left hand fingers. Most Piano pieces are composed with the right hand playing the melody and the left hand the harmony. I feel my brain has to find those neural pathways to undo it's previous conditioning and adapt. Hence to start with playing slowly is the best way forward.
Anyway, not to digress further and to answer your question specifically, yes and no. There are people who can and those who cannot (with the same level of experience and hours of practice). I'm sure the courses have been designed with careful consideration and decades of experience as to what's possible and what's not.
The suggested practice times are indicative and designed to avoid straining your wrists/hands. There are times I've adhered to them and times I've spent hours just like you. Muscle memory has to be carefully built and one needs to pay attention to detail like damping, slurs and overall musicality of the pieces etc.
Many times I've not been able to play a piece decently even after a few weeks. Then somehow it slowly begins to take shape. However, I don't tend to focus on speed so much.
These end pieces are challenging and you're doing fantastic with whatever I've seen of your videos, so don't beat yourself up over them
We have all summer to practice each one of them until the next level.