I can get through an 8 hour day with about a 30 minute drive of chain vaping each way, and three 20 min vaping breaks on a regulated 18350 running a 1.8 ohm coil, but only if it's fully charged when I leave. With that said, I'm still waiting for somebody to make a nice DNA-30 box mod that takes a 26650. I might break down and just get the Hades mechanical.