I think Aragok was simply stating that the timer for this mob is the longest he has seen so far in Dalaya. Maybe we are both new, but we both have camped almost every XP zone there is in the game and several raid zones. The only thing that I know with higher spawn rates are raid targets or adepts. I believe we are just unlucky getting the spell, but we are not complaining about the camp at all. We clear pretty much the whole north side and a bit more on a full "cycle", so difficulty is not an issue. Waiting for the PH/Named just takes longer than most camps, and when only 1/10 PH's is a named (for us anyways), it is aggravating seeing the mask drop every single time (I think we have gotten at least one wizard spell). Maybe there are a lot more mobs with an hour respawn timer in Dalaya, we just have not encountered them yet, but it just seems weird that this is the only one we have seen in the game so far.
As a side note, RSM is pretty much a badass zone, and I don't mind the camp as it is average xp, but camping stuff for this long just wears on you a bit.