What is the cumulative amount of time an individual engages in the target behavior called?

The term that accurately describes the cumulative amount of time an individual engages in a target behavior is "Total Duration." This concept refers to the overall time spent on a specific behavior across a designated observation period. In behavior analysis, measuring the total duration of a behavior allows practitioners to assess how long a behavior occurs, which is particularly useful for evaluating progress and making informed decisions about interventions.

Other terms provided do not encapsulate the idea of cumulative engagement over time. "Instantaneous Duration" refers to measuring behavior at a specific moment, rather than over a span of time. "Cumulative Time" is a vague term and isn't frequently used within behavior analysis to define this specific measurement. "Aggregated Duration" implies a collection of separate duration measures but does not specify the continuous measure of behavior over a period that Total Duration represents.