Session Duration

Session Duration: Average time spent per session.

Formula

Session Duration = Total session time / Total sessions

Computable definition

The canonical formula in the GASP formula grammar. The MCP server compiles it to SQL over the datasets listed below.

avg(field.session_duration)

Unit: minutes

Notes: Equivalent to total session time divided by total sessions. Unit of the session_duration field assumed minutes.

Data requirements

Grain: Per event, aggregate monthly · Frequency: Daily · Aggregation: aggregate (month) · Staged: no · Main source: Product Analytics.

Field	Dataset	Type
`event_date`	product_event	date
`session_duration`	product_event	integer

Example SQL (Postgres)

SELECT (SELECT AVG(session_duration) FROM product_event WHERE event_date >= :period_start AND event_date <= :period_end) AS session_duration

From an agent: with the GASP MCP server, call lookup_metric({ "name": "Session Duration" }) or generate_query({ "metric": "Session Duration", "adapter": "<your adapter JSON>" }).

Benchmarks

Highly product-dependent. Track trend over time.

What It Tells You

Depth of engagement per visit.

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