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Thanks for being "that guy." I think that your day probably has one or two peaks in it where you do your best work, and the rest is more low energy work (not bad, just not the most effective work on tough stuff.) Also, not all hard workers are created equally, so among those who do hard work, some can do more than others. I agree they become more successful but I do not agree their working habits can always be duplicated.

I certainly agree it is tempting to read about four hours of concentration and use the article to justify four hours of mediocre work.