I've been vaping since late February and I have yet to fry an atomizer or carto, even though I chain-vape for much of the day. My most-used hardware consists of 900- or 1100- mAh 510 batteries (mostly Liberty Flight's -- and all of them still live), and basic attys with carts, basic cartos and two eGo-T type B's with tanks. No industrial-strength mods for me, yet.
I'm meticulous about cleaning. Used attys and carts get the isopropyl alcohol in ultrasonic cleaner treatment, plus replacement of the polyester, every week. Used cartos get long multiple steeps in hot water.
But I rotate through at least five separate setups during any given day. I never let the attys/cartos get more than about 20 degrees above room temperature on the outside. So I don't think my attys/cartos ever get up to full temperature for very long. Maybe doing this is the key for my long-lived attys and cartos.