The last character I played was Ktaar, an imperial felar assassin. And I needed precisely 48 hours to kill the Fortress inner. The reason being I could not do it without burning two martial trances. Tanking wasn't the problem. The problem was that the Fortress inner would consistently dispel my protections and lay out UNSPEAKS with divine retributions - and the only thing I had (if I didn't want to expend an equal amount of time digging up non-dispellable DR to burn on a cabal mob) was trance.

Other guardians without dispel I could do in roughly 24-30 hours using the Orb of Twilight unless I got unlucky with maledicts. Which is still a lot of time.

What was I missing? It was incredibly humiliating, and you make it sound easy.