What is behind grave wave how long it takes for the corpes to reach that stage?can some help me please

<moved from Forum Help to Forensic Science>

If you are asking about Adipocere, then you might find some helpful information on the following links.

Adipocere - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Adipocere)

From the above referenced site:
It begins to form within about a month of death, and can persist on the remains for centuries.

introduction (http://adipocere.homestead.com/introduction.html) (This is a link to another site.)

Decomposition: What is grave wax? (http://www.deathonline.net/decomposition/body_changes/grave_wax.htm)