{"name":{"en-US":"duration"},"description":{"en-US":"Value representing a length of time, for example the length of a video. Value should be either a string formatted as an ISO8601 duration to match the Result.duration property or a float that uses the same units as expected with correlating information (other extensions). This extension will generally be used within an Activity Definition to indicate a length of an Activity as compared to the Result.duration which captures the length of time for a specific event. For example a video may be 5 minutes long (this Extension), but an actor may have only watched 30 seconds of it (the Result.duration)."}}