as long as vs if'n

as long as

conj

  • Provided that, if, assuming (depending upon some condition or requirement). 

  • Used other than figuratively or idiomatically: see as, long. 

  • While, Since 

if'n

conj

  • If. 

How often have the words as long as and if'n occurred in a corpus of books? (source: Google Ngram Viewer )