I want to know about the processing time for I-130(for wife in india),if i file in march 2010.
http://uscis.gov has the information you are looking for.
After the petition is approved by USCIS they send it to the National Visa Center. NVC request more information from the petitioner before the case is sent to the local consulate for processing. More information regarding the NVC can be found at: http://travel.state.gov/visa/immigrants/types/types_1309.html