I surely did okay, lasting nine days, back in the mid-1990s, when I was wandering around the socialist paradises of the workers and peasants with free medical care for all--and rare was the sight of decent and civilized plumbing.
There was no way I was going to squat like that.
The trick was to watch what one ate, and to eat very little of that.
Mahorka and weak tea pulled me through it, until I got to civilized plumbing.
I actually became a legend among the workers and peasants (although I wasn't aware of it at the time; revelation came later), who got this idea Americans don't have to do that.
A testament to my intestinal fortitude.