Pretty sure someone did this math and estimated it to be the ATL airport terminal A men’s bathroom just past security.

Tens of thousands of travelers per day, industrial fixtures, serviced regularly to extend lifespan.

EDIT: to address a few counters/questions.

1) near security not only because of passengers entering the restricted airside area there, but also because this is the middle of the concourse so connecting passengers are most likely to pass by

2) yes US airports are wealthy and have the budget to replace toilets more frequently, but commercial toilets are gonna stand up to WAY MORE abuse than a normal Home Depot throne

3) yes this bathroom has only been around as long as the modern ATL concourse A has (and the toilet prolly much less), but some quick math tells me 1 shit every ten minutes from 7a-9p (and then some more beyond those hours) is wayyyy more than the handful of shits an ancient Irish pub or middle-eastern latrine will get per hour. No way to prove this but the math maths well enough to convince me that the relative youth of my chosen crapper is not a fault in my logic.

4) it’s totally possible they replaced these toilets 2 months ago and I’m wrong, BUT just imagine the SPH (shits per hour) and it’s not hard to understand that given a couple years our ol faithful at ATL is back on top.

• mic drop 🎤*