Comment by ecshafer

3-4 year timeline makes more sense for Greencard application to Naturalization, that was 4.5 years for my wife. But its not 3-4 years N400 to Naturalization, no way.

Timelines for USCIS depends heavily on where you are, since some offices just have more people to go through than others. So I have talked to people that one step might be 4 months for them and a year for another person.