How long does google take to re-ranking pages in results?

[engtamous]

I mean when google dance, the pages in results go up and down frequency every minue, but finally your page will rank in any position in google, what is the time when you get another position in google

[JaneCopland]

Brand new pages can fluctuate in rankings for a while before they seem to "settle", yes, but for some queries, results are different day in, day out. There is no set time period for a new page to "find its place". Google seems to sometimes test whether new resources "deserve" good rankings: the page may seem high-quality - if Google ranks it well for a short period, does the page attract traffic? Does that traffic stay on the site? Do people bounce back to the SERP and choose another resource? Does the page attract links? Social media attention?

A page may drop down in rankings for a time, rising again as its attracts more links. There is really no good rule to go by, besides understanding that a brand new page with good rankings may not have great rankings forever, and that SEO work is still required to keep its rankings high.

[engtamous]

Some seo experts said it take one week to two weeks and may took one month to take a new rank to your keywords

[FCBM]

I'd add that at times Google may even start to rank a different page on the same domain with all things staying equal. I've seen clients web pages drop off and other get picked up for a KW we were tracking/trying to rank better for.

[RobertFisher]

There are a hundred variables that affect when and where you rank so there is no way to know when your page will finally "settle" into a given rank. Since we deal with client sites and have to stay focused at times on given pages, I can tell you that there are times when a page bounces around for days, weeks, and months depending on a ton of factors. 
Sorry, there is just know fixed answer.