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After accounting for downtime, context switching time, recovery time, maintenance time, leisure, chores, only about 3-4 hours a day are available to “do stuff.” Assuming 8h sleep, wakefulness is only about 25% efficient relative to any active life mission. Worse than IC engines.
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I suspect a cartoonishly optimized life could hit maybe 60-70% for very tightly scoped life missions, like number theory or piano playing.
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But 3-4h is still better than the effectively 0 hours median in pre-modern life. Life that’s basically all chores and it was a weird thing for life to have a purpose beyond “surviving.”
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When I do put in a 6-10 hour day, I typically have to take a light or rest day the next day to catch up on all the overhead debt. 5 days of 8 hour days (very rare) and I definitely need the whole weekend off to recover. Maybe that’s how weekends started. 5 days is my max streak.
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