Engagement time measures time when a web page has browser focus or an app is in the foreground. Average engagement time per session divides that time by all sessions, including sessions that do not meet the engaged-session criteria.
Average engagement time per active user uses a different denominator. Compare the metric names, date ranges, filters, and aggregation units before comparing reports.
Comparing channels and landing pages can reveal patterns after a visit begins. Longer engagement alone does not establish purchase or lead quality; interpret it alongside the page purpose and completed actions.