Identify the measure used by the report
Barb’s programme-reporting notes describe averaging the audience across the transmission’s minutes, excluding commercial breaks and promotions. That is different from counting every distinct person who watched any part. A report using average audience should keep that label, rather than quietly translating it into a claim that only that many individuals encountered the programme.
Use duration when combining parts
Barb says that a programme split into two parts on the same day is reported using a duration-weighted average. In a fictional example,30 minutes averaging 1 million and 90 minutes averaging 3 million would produce 2.5 million across 120 minutes. The simple midpoint of 2 million gives both parts equal weight even though one lasts three times as long.
Do not add the two audiences as unique people
Adding 1 million and 3 million would not establish 4 million different viewers. Some people could have watched both parts. Unique reach needs information about overlap, while the duration-weighted measure summarises viewing over time. Keep the calculation matched to the question instead of using a familiar total that the data cannot support.
Retain the programme and report context
Check the channel, edition, period and any current methodology notes before comparing numbers from another source. A later amendment to a transmission log can also change a published result. The goal is not to dismiss audience data, but to state precisely what was measured. The example here explains arithmetic; it is not a reconstructed Barb result for a real film or series.
Questions, answered
Can the two part-audiences be added to obtain unique viewers?
No. That would ignore audience overlap.
Why weight by duration?
The longer part contributes more minutes to the programme average.