Basically my question is how long does it take for the last part to be arranged?

Hi,
My F is expiring on the 11th of August.
I will go back home to apply for a Z, in the meanwhile my company already started the application process. (Alien Employment licence and Z invitation letter). They will send this to me while i am back home so I can apply for the Z in my country. My only worry is that i'm leaving on the 8th of September from china to Thailand and that my Alien Employment Permit is not ready in time.

When I arrive with my Z how long I have to count before I can travel outside the country again?