This will return a table of users who conducted searches, the total time it took for searches to complete, a count of said searches, and the last time a search was conducted. *NOTE* You will need to modify “splunk_server=local” specifically the “local” section to represent your Splunk server.
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index=_audit splunk_server=local action=search (id=* OR search_id=*) | eval search_id = if(isnull(search_id), id, search_id) | replace '*' with * in search_id | rex "search='search\s(?<search>.*?)',\sautojoin"| search search_id!=scheduler_* | convert num(total_run_time) | eval user = if(user="n/a", null(), user) | stats min(_time) as _time first(user) as user max(total_run_time) as total_run_time first(search) as search by search_id | search search!=*_internal* search!=*_audit* | chart sum(total_run_time) as "Total search time" count as "Search count" max(_time) as "Last use" by user | fieldformat "Last use" = strftime('Last use', "%F %T.%Q") |