As a kid we had the five-second rule:
if you dropped something, especially food,
you had that much time before germs settled in.
Though I did favor more a three-second version
depending on the drop’s locale.
Forty percent less likelihood for foreign biology to hitch a ride
should a sandwich or a lover’s heart ever touch cobblestone.
Beware the violent rip on the lower back
as you plunge in time
to retrieve
your item.
© Chagall 2014
Alphabet City 
Chocolate gets a longer time — maybe seven seconds.
Due to its texture and anti-oxidant properties, I would agree. Dark chocolate maybe even 9 or 10. —Chagall
You know it, and truffles have so little surface area in contact, they might even go to 15. LOL
As for truffles, even if those are partially bit . . . —CC