This article describes a metric for which there also exists a dimension with the same name. The description of the dimension can be found here.
Shows the length of a media multiplied with the amount of views.
This metric is usually not directly used in analyses but for calculations in custom formulas.
A video is 30 seconds long. Without reference to how long it is played by a user, the media run time is 30 seconds. If the same video is watched by two visitors, the media run time is 60 seconds.