Anyone know if I can find this info? Support wasn't able to provide it for me. Unfortunately I kept in-progress responses open so I can't look at the recorded date of partial responses for this info.

The "EndDate" in the CSV from responses in progress contains the last time an update was made to the server for that session. You could take this is as the time the survey was paused. However, since it only captures the update made to server, you won't know how much time a person spent on the last page.

Finding timestamp from when a survey was paused

Finding timestamp from when a survey was paused | Experience Community

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