H1 Extension Help

[sincanvin]

Hi,

I am completing 3 yrs on my H1b visa in Aug 09 and I need to apply for another 3 yrs of extension. I have I 140 approved and I 485 pending so please answer the following question

1. How much extension I will get?
2. How long this process takes? When should I start this process to be in legal status?
3. Are there any chances of rejection?

Pl. guide and give your suggesstions.

Thanks,
Vineet

[txh1b]

1. 3 yrs
2. Anytime before I-94 expiry. Suggested 6 months prior.
3. Depends on your/employer credentials