Holy crap - a 35 second block - that has to be some kind of record!
naw, i saw a 20 second block once.
I remember a 14 second one. And it's not been too long ago.
And a 4 second one last year.
Shortest I ever seen was block 239570 found by slush on 2013-06-03 in just 2 seconds. Unfortunately it was invalid for us...