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The frames still exist but have the old data. You just need to check the timestamps for the latest data to know how long you want to consider a non-observation to be no person present.

The frames still exist but have the old data. You just need to check the timestamps for the latest data to know how long you want to consider a non-observation to be no person present. If you query with time 0 it will give you the latest known info, which may be old. But the resultant value will have the timestamp of the result that you can check for the age.