Hmm 3-6 months is a lot of time don't you think so? and how do you get backlinks from? Can you give us some tips?
go to the google webmasters page. read, and follow the only tips that actually matter.
google make the rules, everyone else follows. As CFred wrote :" Very few, if any, unmerited link will be considered important enough for Google to list. ": go one further, unmerited links have a very negative affect. those sites promising you immediate results, get results, but the list they get you on, is the blacklist, not good results.
links have less importance than you seem to think, the site content is of more interest to se spiders.
"Proof of Google PageRank" is bovine excreta, Google's algorithm is kept very close to home