Some of our file conversion premium packages rely on the term "conversion minute", so what actually it means?
Almost always conversion minute means singe converted file. The minimal conversion time for any file is 1 conversion minute, so for all CPU-undemanded conversions, that are completed in a matter of seconds (i.e. for the document, image, font, audio conversions) you can assume conversion minutes = number of converted files.
From the other side, some CPU-intensive tasks, i.e. video conversions, may consume more than one conversion minute. It highly depends on the input file frame size, duration and chosed output codec and settings.