You can file the the I-829 so that it is received by the USCIS just before the two year anniversary of the conditional permanent residency. This may give you more time to show the required employment creation. Also the USCIS will consider supporting documents with the filing of the I-829 Petition to show there will be substantial compliance with required job creation within a reasonable time which can be within 12 months of the filing of the I-829 petition.