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At the centre Humans max out at three or four hours of really hard deep work a day, so the eight hours of intense work executives ask for is not available. Holds NFNicole Forsgren Read this korrent →

• Similar wording Nobody can consistently do more than about three or four hours a day of work that demands serious mental focus. Holds OBOliver Burkeman
• Similar wording Nobody can do genuinely hard cognitive work for eight hours a day; the sustainable unit is one or two sessions of sixty to ninety minutes. Holds TWTommy Wood
• Similar wording Crunch is wrong when it is imposed — an executive on a forty-hour week has no business telling anyone to stay late — but a person choosing long hours on their own life's work is not the same thing. Holds JKJeff Kaplan
• Similar wording Forty hours a week is plenty if you do not piss it away in meetings; the eighty-hour week is fluff labelled work. Holds DHDavid Heinemeier Hansson
• Similar wording A person at maximum vibe-coding speed has about three productive hours a day, and a company that will not let them stop there is going to break. Holds SYSteve Yegge