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twocats pianoloverus Most amateurs are never going to practice even 5 hours and most professionals understand that one has to take breaks if one is planning a marathon 8 hour practice session In one day.
It's not about taking breaks, it's about the physical limitation of the brain. If the human brain can only learn for 5 hours a day before it tops out, it doesn't matter if you're taking breaks or not, that extra 3 hours of practice is wasted time.
That was just one example of information about practice efficiency that has nothing to do with learning proper technique.
I think different people have different capacities for how long their brain can work effectively. I think many conservatory and professional pianists practice more than 5 hours per day and feel they are getting benefit from the time beyond 5 hours. So I think that contradicts what Molly says. How could one possibly even show that After a given amount of time any additional practice in was of no use? A much more reasonable statement would be something like after X hours of practice a lot of people don't get much benefit from any additional practice which is, of course, just common sense. I think for most amateur pianists the amount would be far less than 5 hours per day and they probably wouldn't need Molly's book for them to realize that.