I finally got mine today. I leveled 5 different toons to 525 archy, only one of them after I couldn't stockpile my troll fragments to til 450. The toon I eventually did it on was the most recent and she got it last after the other troll rares that we now have.
In total somewhere around 300 solves between all of the toons, around 100 each for two of the toons and around 30 or so each for the others.
Before anyone asks why I leveled up archy on so many toons, it was because doing archy was more enjoyable than doing northrend again for two of those characters and the 2 others that actually did the majority of the solves were dps toons so they did it while waiting for heroic queues. The last one was my alchy and even though I needed tol'vir solves I did most of my leveling in EK on the off chance that the stockpiled troll frags would get me it. Still haven't gotten the recipe either, but I don't play that toon as much so it's not quite suprising.