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A length of time: the seconds an impression must stay in view, the minutes after which a visit ends, the days a window reaches back. It is a quantity of time and names its unit of time, so two durations compare only when both name the same one.

Questions answered from here— 1

• Which arithmetic forms can a unit carry?

Compose from here— 5

Duration can stand in 5 roles across the patterns this model declares. Pick one and the answer is drawn here, from the published graph.

• In what unit a reading is measured board → holds KPIs, Metrics · the question
• Which forms a unit can carry board → holds Measure Form · the question
• Reading board → holds Metrics, Time Windows, Geographies, Audience Segments, Evidence Designs · the shape
• Setting board → holds Parameters, Time Windows, Geographies, Audience Segments, Setting Bases · the shape
• In what unit a parameter is measured board → holds Parameters · the question

Related— 2

• fits form →ValueMeasure Form
• grounds on →MeasureEntities

Pointed at by— 4

• is unit of →Attribution lookback windowParameters
• is unit of →Viewable timeParameters
• is unit of →Session timeoutParameters
• is unit of →Retention periodParameters