ek@l it doesnt matter where he or she files his labor from. like summit said that depends upon categories like EB2, EB3 etc... 

Also, check https://egov.uscis.gov/cris/jsps/ptimes.jsp  to find the current processing time and check http://travel.state.gov/visa/frvi/bulletin/bulletin_1360.html for visa bulletin.

this should give u your answer