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How do “read,” “skim,” and “glanced” categories get defined?

Most ESPs classify reading activity using time based thresholds.

Glanced means opened for only a few seconds.

Skimmed means opened long enough to scroll or scan.

Read means the message remained open for a longer sustained period.

Each provider uses different thresholds. Some define read as 8 seconds. Others require 15\. These categories are convenience labels rather than scientific measurements.