Lengthines or Lengthiness: How To spell?
The word Lengthines is misspelled against Lengthiness, a noun meaning "The state or quality of being lengthy; prolixity."
Lengthiness has double 'ss' in the end mispronounced as 's'Remember double 'SS' appears in the end of this word which should not be misspelled with single 'S'
Wrong Spelling:  lengthine-s  Correct Spelling:  lengthine-ss 
Find more wrongly spelled words of Lengthiness to spell it well.