How long is i485 process time?

[bunnyrabbit]

I file I-485, I-140, and I- on March 22,09.
I received my EAD card on April 7, and got finger print notice for April 15, 09.
My Labor Certificate Priority date is July 15,2008. The USISC sent me a notice on March 24, 09 with tracking number.

I am Taiwanese, file EB2(advanced degree), Nebraska service center.
My H1 B visa expires on October 2010.
How long do I need to wait for -140 and I-485 for approval and do I need to extend my H1 Visa to another 3 years?

Thank you!