The theoretical four-hour daily limit on deep work is based on intense and deliberate practice, observed in professional violin players and extreme programming in software development. Deep work requires complete unbroken concentration, leading to exhaustion after a certain number of hours. In contrast, high quality leisure activities, unless intensely demanding like practicing an instrument, do not exhaust individuals in the same way. Transitioning to unrelated high quality leisure after deep work can reenergize the brain, as argued by Arnold Bennett in 'How to Live on 24 Hours a Day'. Engaging in intellectually stimulating leisure activities can be more rejuvenating than consuming low-quality media.

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