The US work culture is utterly insane. They say that the Japanese work extreme long hours, but from my experience, it's quite similar for big cities in the US.
Sounds like a sure way to a burnout, getting fat, and losing your family.
People who claim to be regularly working 80 hours a week are often over-counting ("I can't remember doing anything but sleeping and working last Monday, so I must have been working 16 hours.") and often not actually working during 30-75% of the time they're ostensibly at work. Walk by the random colleague at a random time and note how much time their screen has code on it vs Facebook, YouTube, or an online shopping site. Sure, they might be studying an online course on YouTube or buying a critical piece of lab equipment for work, but more than likely they are just dicking off about half the time.