This isn't a lab test. The goal is a simple, repeatable routine you can follow on any warm day. You're looking to keep your device performing close to how it does at room temperature. That means no burnt taste, no leaks, and a consistent draw from morning to evening.

You don't need to measure anything. Just pay attention to two things: how the device feels in your hand (too warm?) and how the draw tastes (off? burnt? weak?). If either one changes, your routine needs adjusting.