Average engagement time per session discrepancy

[mcole18]

Hi there, I'm creating a Looker Studio dashboard and want to include an average engagement time per session scorecard. Previous community posts suggest that you can achieve this by using user engagement / sessions but this is returning a very different value than what we see in GA4.

GA4 June 1-30 2024

Looker Studio June 1-30 2024

Looker custom metric config

 I understand that there will be some discrepancies between the two platforms but this is quite significant. Thanks for the help!