Turkmenistan has barely been totalitarian for a single generation; the Soviet Union broke up in my lifetime. And yes, North Korea has persisted through a little over two generations of Kim family control that seems to show no signs of stopping anytime soon from the outside, but that's not too far outside of "a couple" of generations. I'd say that the jury is still out on them, too, but even if the DPRK lasts for a century or more, they become an extreme outlier in the face of every other fascist regime in the history of the world.