Kanata,
In the Processing Chart, Mexico City Shows 6- 7- 8- 9 for Skilled Worker applications received after November 26, 2008 (Federal). However, I doubt this is 100% correct. I will say it takes anywhere from 9-18 months in Mexico City.
I know some people whose cases are handle by Mexico VO.
http://www.cic.gc.ca/english/information/times/international/02b-skilled-fed.asp
Wishing you good Luck!!!
SFD