User blog comment:Tyrant Belial/Feral Flare tests/@comment-5955640-20140406060909

This data appears to be quite reliable. I saw a match where two junglers were wearing wriggles with the intention of turning it into Feral Flame. One was Master Yi and the other was Udyr. Master Yi did really well while Udyr did quite poorly. They both got Feral Flame at around the 15 minute mark as expected.

I find that result interesting as usually the caveat to a stacking item is whether or not you'll even have the time to stack it. It would probably require more plays but I would love to see a range of time or like how long it would take if you don't rush getting this item right away.