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It's my understanding that when people say "working hard" in these discussions, they aren't comparing 25 hrs/week vs. 50 hrs/week. They're usually comparing 50 hrs/week vs. 75 hrs/week.

If I forked my life into a version of me that worked 50 hour work weeks and one that worked 75 hour work weeks, the 50-hour me would win, hands down. The 75 hour work week me would outright miss most of the key strategic decisions that got me where I am. When I look at everything I've done that in hindsight has been a huge career boost - getting involved in the Harry Potter fandom, making friends on the C2 Wiki that got me a job in financial software, learning Lisp & functional programming, founding a startup, and getting a job at Google - they all happened in the downtime between work. Had I simply worked 75 hour work weeks since 2001, I would be a physics grad student right now, hating it, and making a pittance. I'd probably be a damned good physics grad student, but that doesn't help me very much.

Now, I also put in quite a few hours into developing skills and building a track record, and I don't think those opportunities would've opened up if I hadn't. But I wouldn't have thought to look for the opportunities if I did nothing but concentrate on work. You're a big fan of necessary but not sufficient conditions, right? The work is necessary, but so is the downtime.

And you're STILL assuming that the 75-hour work week you would not get a severe case of burnout and turn into a 0-hour work week you for a year, after which going back to the regular schedule would simply not feel like an option.

Even if you didn't assume that, there is still an underlying assumption that working harder and getting more more money will in the long run make you happier than working shorter hours and having less.

I guess it depends on how much you are making. For 300k, I'll work 75 hours a week and not burn out. The incentive is there.

If you con me into working 75 hours a week for 70k, I'll burn out when I realize I've been wasting my time propping up a loser.

I'd imagine most people are the same. Pay them enough, and they will cope with terrible conditions. Con them, and they will lose interest a lot faster.

You can still burn out at 300k. Actually, you might be more likely to burn out with a higher salary, because you will find it easier to rationalize abusing yourself by cutting sleep, healthy food, friends, etc.

Burnout is an unconscious phenomena - you don't realize you're burning out while you're doing it, and in fact it often feels quite exhilarating. It's pretty easy to be making 300k and suddenly find you just can't perform the job duties that net you that 300k. It's not a matter of choice, determination, or coping, it's a matter of your brain refusing to do the things it needs to do.

> Say we fork the universe now and one version of you works 25 hour weeks henceforth, which the other works 50 hours per week henceforth. Who retires with more money and more impact on the world? Both version of you are equally smart. The well-rested you might make SLIGHTLY smarter decisions due to happiness/lack of fatigue perhaps... But surely you wouldn't contend that the success outcomes (professional impact and wealth, for the sake of argument) wouldn't be different.

It's hard to tell. Would I work better and smarter knowing that I only have a slim 5 hours a day to get stuff done? I think it may have more positive effects than you think - particularly if the rest of the time was doing things that will restore my energy (e.g. cultural activities, meeting people, sports, relaxing...)

Sure, YC encourages a kind of work-work-work attitude, and I'm not suggesting this necessarily will hurt you - in fact, because every YC founder is basically completely incompetent (at the beginning) and thrown into a maelstrom of challenges, it's not that surprising that there's a culture of working long hours to make up for lack of initial competence. But to suggest that somehow the eventual success comes because of the long hours (rather than because of the connections and wisdoms imparted by YC, as well as the fact that all or most YC founders are very smart) seems a bit confused to me...

I have no doubt that determination and enthusiasm are positively correlated with both success and with working long hours. However, as a rational skeptic, I've yet to see evidence that working long hours has a causal relationship to success.

However, there is evidence to suggest an inverse relationship may exist. Furthermore, hazing is effective in building solidarity, and people are generally more likely to retroactively justify hardship, which makes me think there may be a psychological bias towards overvaluing poor work/life balance.

In my particular line of work, Daniel Cook put it better than I ever could: http://www.lostgarden.com/2008/09/rules-of-productivity-pres...

Who said anything about causal?

"However, there is evidence to suggest an inverse relationship may exist."

So you'd bet that if I shadowed 1,000 self-made millionaires while they were building their businesses, and then shadowed a random sampling of (employed) Americans, the millionaires would work LESS than average? Really?

FWIW, I do agree that specialized knowledge work doesn't benefit from tons of hours... As someone pointed out in another comment, entrepreneurial success generally requires a wide variety of different tasks.

"So you'd bet that if I shadowed 1,000 self-made millionaires while they were building their businesses, and then shadowed a random sampling of (employed) Americans, the millionaires would work LESS than average? Really?"

No, I never said anything of the like. In fact, I said that the qualities more likely to make you successful are also likely to predict working long hours. What I would say is that if you could make two copies of the world, one where entrepreneurs work reasonable hours and one where they work extensive hours, they would generally have better outcomes with the former.

In essence, it seems that working in crunch mode for extended periods of time is a bad habit of highly motivated people.

"Entrepreneurial success generally requires a wide variety of different tasks."

Obviously, there are all sorts of businesses and all sorts of entrepreneurs, but I'm not sure that the data available suggests that working with varied tasks alleviates problems of fatigue. Additionally, the penalties of multitasking are generally well documented. If the tasks just need to be completed and are straight-forward, or if you're in a short lead-up to a deadline, certainly there are times when it makes sense to work extended hours.