I don't agree that this thread should be moved — I wouldn't say it's a model to aspire to, but it does show just how adaptable some people are to conditions that would fell other people pretty quickly. It might as well apply to Paul Wittgenstein or other one-armed pianists, or Horace Parlan and his missing fingers.
Yes, that is an awful lot of alcohol. But, over twenty-four hours (assuming he didn't sleep and didn't have some kind of funnel system devised to keep infusing him with nutrients), and for people of different sizes and habitudes, I believe it.
I know a "fifth" (US term — it's supposed to mean a fifth of a gallon, but is in fact 750 ml) of liquor is about seventeen drinks. A quart is a healthy bit more, but I don't feel like doing the math in my head. And, from what I hear, especially back in the US Prohibition days, they sold things like "flat fifths" and I don't know if the average person could eyeball a bottle and say if it was a quart or a fifth or whatever. So, that actual amount may be in question.
And the beer? I don't know if it was the now-standard "PBR/Miller High Life/Bud" 5%, but aside from getting some pretty healthy gastric effects, that much alcohol and more can easily be a breakfast for some otherwise high-functioning people. I've heard.
And, yes, to clarify, it is perfectly reasonable to dink the equivalent of twenty or thirty units of alcohol in the morning, over a few hours, and have a perfectly reasonable, respectable day. After work? Well, have some more. Socialize, have a few, then get home and have a dozen more and go to sleep. Rinse and repeat. It's not healthy, but it's not something inhuman. It's unreasonable, and not good for you, but I think a lot more people who seem "straight" — shower, shave, steady hands, no mistakes — do similarly than you might think. Is it "sustainable" as a lifestyle? Probably not, but it can work for at least a few years until something gives out physically or you start making mistakes in dosage.
And get at night and start to playing? Well, some people aren't going to turn down some gifts from the audience. Just keep going.
I'd say he was just being a professional about it, even if he didn't feel much like socializing until he knocked down twenty or thirty drinks/beers over a long "breakfast" the next day.
I'm not a medical doctor or anything, but IME, if he was drinking that much daily or even regularly per day, he likely would have had serious problems if he stopped, especially in the days before benzodiazepines as a treatment.
And his playing would have suffered, even if he weren't to have died from seizure or something else. His playing might have suffered just because he was in an unfamiliar environment, physiologically and psychologically.
I recall Dr. John/Mac Rebennack in his autobiography talking about what a PITA it was starting to play solo piano jobs after cutting out H from his diet.
You know the old story/joke about somebody sees "[insert bass player/whoever]" playing wasted drunk and asking him "How can you play like that, man, after drinking so much?"
"It's easy, kid, I practice that way!"