10 minutes to cool down and hydrate every four hours.
This was the laws they found so egregious that they had to overrule them at the state level? I work at a desk in my temperature controlled house where I get to set the AC and I take ten minutes every couple hours to stretch and hydrate.
I work an outdoor job in another hot state. We typically take a water and shade break every forty-five minutes or so for about fifteen minutes. Not having those breaks, especially when we're in head to toe PPE, would kill most of us and we're used to it.