As per CIC, the general timeline for completion is 6 months irrespective of whether it is FSW, CIC or PNP. But going by the pace at which ppl are getting RPRF, I would conservatively estimate it be somewhere between 2.5 and 4.5 months (considering the holiday season that is ahead of us). In case of PNP's it is a shares responsiblility between the province and CIC as province has already validated your work experience. In terms of your work experience, CIC only checks if you are documents submitted are genuine, so I presume it should be faster.
There was a tool that was developed by one of the folks in this forum which shows average processing time based on the past few months of data. Will look for it and will share.