Unfortunately, as of the latest Google updates, we have had to change the way that we deliver estimates to our clients and consumers. There have been some serious changes in A) The way Google indexes links B) The way Google views original content C) The way our Keyword Tool pulls your data and assimilates it into a single number.
These things all combine to create an uneasy feeling in our SEO Engineers because for the last year we have been operating under the same conditions for ranking a website; however, with all things - change is inevitable.
So therefore, we no longer offer ranking estimates in terms of weeks or even months. What we do offer for ranking estimates is the keyword's competition for the Top 10 ranking sites in Google and an aggregate number that accounts for the ranking difficulty on a scale of 1 to 70.