hehe... my best record was 50-60 times in one go.
one handed(right hand) approximately 9-10 times
thats where i got my elbow busted...

currently my muay thai master can do push up with both his thumb only more than 30 reps and still going. =.= hahaha...
many of my seniors can do 2 finger push ups... but both hands... not single hand. =.=
some can do 3 finger one arm as well. =.=
i am just waiting to do that in the future...
haha...

haha i think most of us here do not do it EVERYDAY.
i think they only do a bit once a while, or during chest days.
=.=
i think 3 sets of failures is good enough.
if ur max is 10 push ups, then doing 3 sets of 10 is better than...
having a max of 100 push up, but doing 3 sets of 50. =.=
hahaha...
its all bout intensity... not the amount of reps.