Not sure how a 16 hour workday fits if you also need to sleep, shop, cook, clean, take care of the kids, keep in contact with your friends and family, and exercise.

It doesn't - unless you need very little sleep.

I had a crunch delivery before we had kids, and it was hell. In the office by 9, leaving around 3 or even 4am. 'Luckily' the office paid for cabs and food and tried to make it as good as they good for us, but I didn't see friends, barely saw my wife and felt rotten at the weekends.

BUT, we delivered some amazing work, was well compensated, and otherwise rewarded by the company. Many of those who did the work are still there and still rate it as a place to be. It was a one off that we all swore off repeating, but I don't regret it or the work we delivered.

Unless we’re talking about finding a cure for cancer, there isn’t anything that matters enough to work 16 hour days.