I mean, basically you're on duty 24/7 making sure that creature doesn't try to kill itself through dumb luck. I'd say it is closer to 168 hour a week job during the early years.

No company with that sort of attitude. While time and attention are finite, good organizations can find better ways of distributing work and responsibilities so that one's job is not the preempting force in one's day to day life.

Lots of teams could be productive with smart people that work 3 10-hour days each week.