Link Building requires a lot of patience and perseverance to take effect. Other sites will link to yours only if they find your site to be relevant to their's. For other tips and details on link building you may visit http://linkmasters4all.wordpress.com/2009/06/13/how-to-do-the-link-exchange-keeping-seo-in-mind/
Realistically, though, it can take 3 to 12 months to see any change in your site's visibility. It's helpful to consider a few important factors that influence the impact velocity of link building, too. Let's look at these factors and a few examples of how fast link building brings results in different niches
Dewormer typically takes about 24-48 hours to take effect in cats.
about a half an hour
5 months
never
2-3 hours
12 hours
The problem with building castles out of stone is that it would take to long to build.
The Flatiron Building took 90 balls to build
Depends on where the building is. A permit is required and that permit has to be approved.
It depends how wet it is, how heavy the building is, how well built it is, etc
15 years