Trying to time this is going to drive you nuts, and you may spend HOURS just trying to find the right cycle since there are claims here of 66 second and 78 second cycles, and there are multiples of each cycle. Plus there are also 36 second cycles. On top of that, numerous mobs kill each other in SK. I caught "a werewolf" killing one of the elephants. Brother Qwinn kills gnolls. Gnolls kill wolves. I don't know what kills "a putrid skeleton"/Ghanex Drah, but something does. You're going to end up with weird respawns or respawns out of tracking range that will make timing this difficult. Even at 300 tracking, my ranger can't see the whole zone.
Dynamouse made a great post 7 years ago. Look for "an elephant." I have only seen two up at once at the same time. One is allegedly for Cracktusk, but the other is for Quillmane. Just mass kill anything listed on this page that could be a placeholder until you start finding "an elephant." Then pull and kill only the mobs on those cycles. You'll eventually get Quillmane or Cracktusk. It beats the heck out of trying to time various mobs that may or may not be part of the right cycle, and it is much faster!