What is session duration?
TL;DR: Session duration estimates how long someone stayed. It is useful directionally and imperfect at the edges — especially the last page — so pair it with events and conversions.
Why the last page is hard
Analytics often learns a page was left only when the next page loads or a heartbeat stops. Without that signal, trailing seconds vanish.
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Frequently asked questions
How is session duration calculated?
Typically from the first hit to the last measured interaction. Time spent on the final page is often undercounted without heartbeats or exit signals.
What is average engagement time in GA4?
GA4's engagement-focused timing metrics differ from classic average session duration. Treat them as related, not identical.
Is longer always better?
No. A short, converting visit can beat a long, confused browse. Pair duration with goals.