Once the search engine robots have indexed your pages it can take a month or so before Google assesses how important it considers your website to be (or at least until it uses these results). This delay or dampening mechanism was introduced partly to prevent dubious short term websites from appearing and disappearing overnight. This is the main factor in determining how long your website takes to reach the top few places.
This means that search engine optimisation always take time.
Realistically, for Google this means months, and in competitive markets 6-9 months for top positions. Of course we have some clients for whom we've achieved top 3 places within one month on good keywords, but not in very competitive markets!
Timescales on the other major search engines are very variable. In 2006/7 we usually see good rankings on either Yahoo or MSN within 1 month, but sometimes these take longer.
When comparing SEO companies it is important to consider the dates quoted. Cornish WebServices have had to revise their estimated timescales. On the old MSN algorithm, pre 2006 we usually got very good MSN results within a week or two, and would be surprised if all target keywords were not top 10 within a month. Since 2006 this is less often possible for MSN.
The same applies to Yahoo, where we used to achieve top 10 in 2-3 months maximum, more usually 2-4 weeks. Timescales to get top 10 search engine rankings have lengthened and become more variable for Yahoo.

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