Did the laws change? I was certain that it was 2 years, then went to check CIC and it's 2 years (news release from 2012):
"Citizenship and Immigration Canada (CIC) has introduced amendments to the Immigration and Refugee Protection Regulations (the Regulations) which apply to spouses, common-law or conjugal partners in a relationship of two years or less with their sponsor and who have no children in common with their sponsor at the time they submit their sponsorship application. The sponsored spouse must cohabit in a legitimate relationship with their sponsor for two years from the day on which they receive their permanent resident status in Canada. If they do not remain in the relationship, the sponsored spouse's status could be revoked. The conditional measure only applies to permanent residents whose applications are received on or after October 25, 2012—the day that the amendments came into force.
Aside from the need to satisfy the two-year requirement, conditional permanent residence does not differ from normal permanent residence."
Source: http://www.cic.gc.ca/english/department/media/backgrounders/2012/2012-10-26a.asp (under "What is conditional permanent residence?")
OP has been in a common-law partnership with the future sponsor for 2 years, and plan to apply after 1 year from now (vide quote below), totalling 3 years of common-law partnership by the time the application is submitted. They will have satisfied the two-year requirement.