China Work Permit Application

Hi,
My application for working permit in Hecheng labor bureau and Shaping labor bureau has been approved last April 19,2011.According to my employer it has been forwarded to Jiangmen Local labor bureau for approval.How long it will take to process my application in that office bureau?Until now there's no update from my employer since April 19,2011.
Thank you.
Mr.Emilio Z.Vargas