Dekay- The bottoms of ones feet are naturally tough.Probably from our ancestors who use to walk on hot coals at beer and pot parties.My hands are nurses hands.Frequent washing and lotioning.I pamper them!
To answer your question..when I stuck my bare (R) foot
on the (36 hours on) Aleph I kept it in place for several seconds before quickly removing my foot with a same time comment of "OH,SHIT!" When I was hot glueing the "corner tunes" there was a continuous scream throughout my glueing procedure.There is no comparison to the pain level,trust me.