Time taken for processing Green Card Application

I have an L 1 visa and my spouse has an L 2 visa. Our consultant - scbusinesscorporation@gmail.com

has informed us that we should apply for a Green Card and it should get processed within a couple of years. Can anyone let me know if we can actually get a Green Card and become Residents in the US.

What is your country of birth? What category does the employer want to file in - EB-1 or EB-2?