18-24 in a single sitting is not unusual. I was a binge drinker so this was a norm for me. I would not drink for days, even weeks then have a binge for several days of copious amounts of cheap beer and vodka. Would lay waste to my body and would require 1-2 days recovery for every binge day.
How I didn't cause permanent damage is beyond me. Recent blood work and other tests/proceedures all normal.