Need some help. GC related question

[boxi]

My wife's H1B is going to expire ( 6th yr) on DEC 20th 2011.

1. When she needs to start GC processing to get extension for 7th year. Could you please give me last possible date? What is the name of this first step of GC processing?

2. How long time is required for other process ( like giving advertisement etc) by GC processing employer before submitting GC application to USCIS?

Thanks.

[immihelp]

1. Dec 20 2010
2. Read /employment-based-greencard/