I recently asked a question about the acceptance of postdoc years to be counted as professional experience for a professional engineer application (in Ontario, Canada). The answer I got (partially) reads as follows:
Academic experience is not usually considered "professional", although I also assume there is a way for very experienced academics to become members. In any case, actual assessment is done on a "competency" basis where you write a summary of your experience and they assess your suitability. I would expect that 24 months of academic experience will not give you the professional competency they expect.
I know many assistant professors (without any industrial experience but some years of postdoc) who had become professional engineers around a year after starting their tenure-track positions. So, does one know how this works in Ontario, Canada, if postdoc really is not taken for the required 48 months?