Are you looking for total work per resource? Assignments (resources + tasks) do not have duration but work.
Try this:
Apply the Task Usage view
Ensure the Work field is in the table on the left.
Create a new group
Group first by Outline Number
Then by Resource Names
Check the box "group assignments not tasks" and set the group by on Resource Names to assignments.
This will show you summary level 1 tasks and the resources assigned to the tasks underneath.
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