Hi
If you have all forms filled in correctly, there's no interview, there's no problem with your medicals, and there's no problem with your background checks, it will probably be between 12 and 18 months.
Better add a year on to the estimate, Buffalo is quoting 17-28 months for 80% see:
http://www.cic.gc.ca/english/information/times/international/02a-skilled-fed.asp#westPMM