Displays the average length, measured in seconds, of all of the phone calls made to your custom Google forwarding number that appears in Google Ads call extensions or call-only ads.
This column is available only in a call metrics report.
View this column in a Call metrics report-
Navigate to a Google Ads engine account, campaign, or ad group.
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Click the More▼ tab, and then click Call metrics.
The column is included in the report.