Evidencev1

Deep work capacity averages 3-4 hours per day for most

Deep work capacity averages 3-4 hours per day for most knowledge workers: sustained focused attention follows a biological depletion curve independent of motivation or discipline

Why This Is Evidence

Newport/Ericsson research on sustained focus limits.

Source Lessons

L-0076

Deep work requires attention scaffolding

Extended focus needs environmental rituals and structural support to sustain. You cannot will yourself into deep work any more than you can will yourself into sleep — you have to construct the conditions that make it inevitable.

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