Here are the processing times for federal skilled worker under the old rules: http://www.cic.gc.ca/english/information/times/international/02a-skilled-fed.asp
You can see if 27 months is getting close or not. If you are from one of the countries where the processing time is much longer, you may want to check if you qualify to apply under the new rules. You do not have to withdraw your old application to apply with the new.