Brain Recovery After Exhaustive Mental Work: Timeframe & Limits

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Ry122
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What determines how quickly normal function is returned to the brain after long periods of mentally exhaustive work? Is it similar to the body's other muscles in that the time for it to return to normal is dependent on how much work was done in a particular time period? ie. after doing 5mins of hardcore benchpressing it can take days for your arms to return to normal.
And what would be the maximum time it could take, more than a day?
 

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I have a couple more questions.
Is the decreased brain function that you experience after long periods of mental work entirely due to a lack of glucose and oxygen to the brain or is it also because of something else?
Does the speed at which the body restores oxygen and glucose to the brain vary among different people by much?
If so what physical difference in the body/brain causes these different speeds of glucose and oxygen restoration?