They say it takes 21 minutes to achieve full immersion

One can assume the power of the immersion 

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The length of time the mind is willing to further immerse; produces a magic of sorts; a power otherwise unavailable in the absence of the respective immersion time of generating flow.

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The product and value of this window of time

generates a novel energy; effect of activity

 

Fruit and effect of the focus 

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there is no coming to revelation without sacrifice, "pain", the discomfort associated with going against compulsion.