Fuck if I know! I always bite mine about 10 seconds into it.
The Leprechauns do not forbid the drawing of Their images, as long as we color within the lines. ~ Ghoulslime H Christ, Prophet, Seer, Revelator, and Masturbator
I noticed that they claimed "approximately". You may find people with tongues as rough as a cat's or as smooth as a woman's breast, and differences in saliva that could account for a fairly wide spread. I usually bite into 'em once the candy is pretty much off, IIRC. I haven't had one of those things in years.