You know the drill - If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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See pg. 391-392 of The Role of Deliberate Practice in the Acquisition of Expert Performance.pdf), the paper that kicked off the field. A better summary is that 2-4 hours is the maximum sustainable amount of deliberate practice in a day.
Ah, so that's where you are coming from.
Well, first of all "deliberate practice" is different from "learning". The paper is concerned with ability to perform which is the goal of the deliberate practice, not with understanding which is the goal of learning.
Second, the paper is unwilling to commit to this number saying (emphasis mine) "...raising the possibility of a more general limit on the maximal amount of deliberate practice that can be sustained over extended time without exhaustion."
I certainly accept the idea that reso... (read more)