It takes roughly 2 minutes and 29 seconds to kill Slabhide. The mount has a 1% drop rate. I killed him approx 8 times (so my mod tells me), but I know I’ve done it more than that while leveling on Normal mode. Ta-da Reins of the Vitreous Stone Drake.
As a very casual World of Warcraft player something that I can do in the wee small hours is grind for the strange and rare items. One of those is the very rare mount from the dragon Slabhide in Stonecore – called the Reins of the Vitreous Stone Drake. It is another 1% ish drop, but this is farmable by a small team on Normal mode, or can be solo’ed by Death Knights (as well as some other classes I’m sure).
So far I’ve tried this once, and it’s now one of the silly things I’ll be grinding when I need something to do and the Darkmoon Fair is not in town. I’ll probably never see it, but its good to have goals.