So, what happened...
When I started practising this way, I had two weeks to my next lesson. I had practised the three pieces that my teacher and me had worked with for at least a month every single day, so I reckoned they were all in need of a break. I made a schedule for my new Bach piece according to Molly's instructions.
Then after one week of amusing myself with Bach, I returned to practise my lesson pieces again. One was still quite okay, even though I had lost speed; the other two pieces had deteriorated badly. I put my Bach on hold and panick-practised my lesson pieces, and just in time for my lesson, they were somewhat presentable.
Of course, that made me think.
First of all, I have never experienced this magical improvement after a night's sleep. Never! Instead, I always start the day a bit worse than I played the day before.
Maybe this is because I don't sleep all that well, and not that long. Most memory consolidation happens during the 7th and 8th hour of sleep, well, I usually sleep about 6,5 hours. And trust me, I have done everything I can to improve my sleep...
Second of all, I have never experienced a magical improvement after not having practised for a week or so, for instance, after a holiday. Instead, I need to work my way back to where I was.
Molly said: Experiment, and find out for yourself.
I am still interested in working with a schedule, but after practising a section on day 1, 2, 3, 5, 7, 9 (as in Molly's schedule), I will not take a break for six days. Instead, I will take a break for two days, and see how that goes.