The published course duration doesn't seem to add up to 35hrs, why?

The published amount of time for each module adds up to 23hrs, plus 12hrs for all four practice exams, totalling 35hrs.  

Please note that some people may take longer or shorter to finish the course than the published duration (usually shorter).

We are also a Registered Education Provider (R.E.P.) and completion of our course is confirmed to qualify you for the 35 contact hours required by the PMI.