that depends on how you send it.
REGULAR MAIL:
Citizenship & Immigration Canada
Canadian Experience Class
Centralized Intake Office
P.O. Box 4000
Sydney, NS
B1P 1J3
Canada
OR BY COURIER:
Citizenship & Immigration Canada
Canadian Experience Class
Centralized Intake Office
47-49 Dorchester Street
Sydney, NS
B1P 5Z2
Canada
I would recommend you to read the guide
http://www.cic.gc.ca/english/information/applications/guides/5609ETOC.asp
Goodluck!