This is just false but I suppose it’s all a matter of what you call “work”. For some people, going to client dinners and golf outings is “work”. I agree coding for 55+ a week is difficult but there are plenty of folks that have this ability to sit down and grind.
The idea that some economist at Stanford discovered a secret 55 hour breaking point for productivity that generalizes to every human on earth is beyond preposterous.
I suspect like many economist papers this does not replicate and is simply a means for generating headlines to help this person get tenure or funding for their work.
This is borne out in data from a British bomb factory during WWI. https://onlinelibrary.wiley.com/doi/epdf/10.1111/ecoj.12166
Figures 1 and 2 (page 2060 and 2061) show that, across four cohorts doing different tasks, output plateaus at about 48 hours/week. Indeed, output from 70 hour week (10 hr/day x 7 days) was slightly lower than a 48 hour week (8 hr/day, with Sunday off). These workers were pretty motivated by the circumstances and doing skilled but not particularly creative work, so I suspect this is likely an upper bound.
There's lots of interesting data about working conditions from the the Health of Munition Workers Committee.
As another commentor says, it simply can't be that marginal productivity drops to zero. At least, if you're trying to produce, there's some external motivation, then it'd take something really serious (starvation, massive sleep deprivation, etc.) to make it actually zero; more than just 'a long week'.
It's like if you're super motivated and work all-night on something exciting: if you were rational for a second, you'd realise you'd probably accomplish more on it with a few hours' break to sleep. But that doesn't mean the alternative is doing nothing in the last x hours.
It can even fall below zero. Imagine the totally overworked surgeon killing his patient because of fatigue and total exhaustion. His net productivity has fallen, reducing the outcome of the last 12 hours.
His contribution to 'product' is providing the service of surgery; he has done that.
But yes, overworked and tired surgeons are more likely to kill patients; killing patients bad; overworking surgeons bad. (It's just not a 'productivity' issue.)
After the 55th hour, there was certainly productive work being accomplished. Less productive than the 1st hour I am sure, but the amount of valuable work being done was more than zero. It was observably evident.
BUT if you know your workday is exactly 8 hours with a 30 minute lunch in the middle, you'll pace yourself differently.
The difference between two equal people doing the same thing, one working until they drop and the other working 8 hours and leaving, isn't big enough to warrant the longer hours worked in the long run.
The one working longer hours might get more work done for a day, maybe a week or two. But after months of work the first person is burned out and the second one is still going strong.
I work a full time job and contract for at least 25hrs/week.
In my full time job I’m paid for 40hrs but not all 40 of those are productive. I take an hour lunch, we have a bunch of meetings and social things, etc.
If you ask, I work 65+ hours per week. If we’re being honest I probably only work 40 or less between lunch, catching up with coworkers sitting in meetings not doing anything, etc.
Law firm partners also don't generally make the same money on their 80th hour. Partnerships will split up the profit at the end of the year, and the number of hours billed and size of the partner's "book of business" factor in heavily here. The size of the book of business depends on the number of hours the partner bills (overseeing associates and paralegals, as well as doing independent work), so working more will increase a partner's share of the annual profits.
Also, a partner whose time is in high demand can raise rates (sometimes done by reducing discounts or charging clients a "NY rate"). So a partner who has plenty of work and doesn't mind not having more work can simply raise rates and make the 80th hour more expensive for clients.
I think you need to be a lot more specific citing 'evidence'.
No, I am correct here, and there is no "confused language" in my writing. This has been studied by prominent economists at Stanford University, which is ironically one of the worst Universities in the US for encouraging "working nonstop".
Once you work over 55 hours per week, your productivity at that point effectively becomes zero [1]. You effectively cannot accomplish anything more, productively, as a human, past 55 hours of work per week.
I suggest that you become more aware of human limitations, along with becoming more aware of human behavior, especially human tribalistic behaviors. Then you would not fall for these kinds of falsehoods. It would help you play "the game" more successfully, which you seem to take interest in.
[1] The Productivity of Working Hours (Stanford University study by economist John Pencavel): http://ftp.iza.org/dp8129.pdf