These conversations are always pretty funny. There's always people at the extremes saying things like that person in the podcast, and I've heard Dan Plews say the same thing about supplementing sodium.

IMHO like many other things, it's pretty individual and you need to figure out what works for you. I can go about 2 hours without having issues, but after that my energy level drops, regardless of how much I eat. Hot days are significantly worse for me.

I've done two different sweat tests: PH and Levelen, and both say basically the same thing; I lose around 1800mg/hr of sodium at tempo intensity (and I sweat about 1.8-1.8L/hr of sweat on hot days), so I know that for ME it's really important when I will go more than 2 hours.