The Preview Time is usually found in video files such as MP4, MOV, AVI, and the like. It gives information about how many seconds of a video preview is available within the file. An audio preview is not typically given.
It is rare to find such a preview in common video files since it’s a rather advanced setting. Hence why in most cases, the Preview Time is set to 0 seconds (0 s).
Sometimes, AAX files, which are audiobook files from Audible, can contain a Preview Time as well.