Web Developer Cum SEO Analyst Question:

Google Dance is an outdated slang term used to describe the time period when Google rebuilds its rankings, and as a result of this rebuilding, the rankings order of Websites on Google’s SERP may fluctuate repeatedly.

The results fluctuate widely within a 3 to 5 days period. Googlebot revisits every website, figures out how many sites link to it, and how many it links out to, and how valuable these links are.