input: [Description] The average time, in seconds, that a user interacts with a Rich Media ad. An interaction is any mouse movement that a user performs over an ad for more than one second (for example, clicking an ad or positioning the cursor over a specific part of an ad). Multiple interactions with an ad during a single ad view are aggregated. For example, if the user mouses over an ad for one second, then mouses off, then on again for two seconds, a total of three seconds of interaction time is recorded. [Metric] 
output: Average interaction time