grep '^[qwertasdfgzxcvb]\{12,\}$' /usr/share/dict/words
"stewardesses" seems to be tied with:
aftereffects desegregated desegregates reverberated reverberates
"stewardesses" seems to be tied with:
aftereffects desegregated desegregates reverberated reverberates
Wrong thread, maybe?
BTW, OS X's dictionary (/usr/share/dict/web2 - Webster's Second International, 234,936 words) is more complete than Linux's (and doesn't contain plurals!) :)
aftercataract
devertebrated
gazetteerage
reasseverate
terracewards
tessaradecad
tesseradecade
For the right hand, on Ubuntu:
grep '^[yuiophjklnm]\{9,\}$' /usr/share/dict/words
polyphony
Anything longer on OS X?