A post shown twice to one person adds two impressions and one reach.
Impressions measure exposure, not interest.
Glossary
Impressions: what it means
Impressions count how many times a post was shown on a screen, including repeat views by the same person. They are always at least as high as reach, which counts people once. Networks differ on what counts as a view, so compare impressions only within one network.
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How is reach different?
Reach counts each person once. Impressions count every showing, so impressions are equal to or higher than reach.
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