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how productive can a person bee if they wake up, immediately commute to work, labor for 12 hours(!), and then immediately commute home, sleep?

Very. At least for the first decade.

The say goodby to sanity, family, and hobbies.

I'm dubious about this. I've worked similar schedules and I just didn't see a point in living.

No way this is true. Especially decade part. After a decade of such work you’ll age at least 20 years.

Maybe a bit more, so the beatings will continue until morale improves. The accounting happens in the birth rate.