Updated: April 23, 2026
If your Average Engagement Time shows 0m 00s in GA4, it is usually caused by tracking limitations, environment restrictions, or missing engagement signals — not simply a system bug.
Issue
In Google Analytics 4, the metric Average Engagement Time appears as 0m 00s, for example:
Root Causes (Complete Breakdown)
GA4 relies on user_engagement and user_engagement_msec (based on page visibility, focus, and session activity) to calculate engagement time.
- Shopify Custom Pixel limitations：When GA4 is implemented via Shopify Custom Pixel, it runs in a sandboxed environment that does not have full access to browser lifecycle APIs, which can prevent the user_engagement event from firing properly.
- Missing user_engagement Event： In restricted environments or short sessions, user_engagement events may not fire, resulting in missing or inaccurate engagement time reporting.
- Low Engagement Sessions：GA4 only counts engagement when: ≥ 10 seconds on page OR a conversion occurs OR ≥ 2 pageviews， If users bounce quickly: engagement time = 0
Solution
If you are using Shopify Custom Pixel with Google Analytics 4, avoid relying on this setup as it runs in a sandboxed environment that prevents proper engagement tracking; instead use native GA4 integration or theme-based installation, with server-side tracking as a supplementary option.
The user_engagement event is not a bug but depends on browser lifecycle signals, so it may not fire in restricted or low-interaction sessions, and there is no direct fix beyond ensuring proper tracking conditions.
To improve measurement, focus on increasing real engagement such as sessions longer than 10 seconds and meaningful user interactions.