Am tickled to see this here, having done these calculations myself in the same place several years running (due to summer visits at the Pole for work from 1997-2011). The author doesn't mention workouts. There are good gym facilities at the Pole, and there's nothing like a half-minute shower (the author's "Option 2") after using them. Now that I know there is an appetite for shower recipes, I'll share mine from 2011[…
Did anyone ever engineer the shower heads to reduce the GPM and thus, increase their shower time?
1.8gpm is the current standard for California, just as an example, and I would say subjectively ~2.5gpm is where you hit genuinely satisfying amounts of water.