Wig that made from human hair take how long to biodegrade?

Varies. Many variables on the lifespan of a human hair wig: quality of construction, how often worn, proper maintenance, additives like hair color. Thus, one can last from few weeks to several years.
Depends... ...On the quality of the hair and how carefully you take care of the wig. The stock answer is one year, but expensive wigs can last much longer with proper maintenance.