Hi
info_min_time and info_max_time represent the bounds of your search - time window. So 'All time' will be 0::infinity.Try setting the time window to '7 days' and you will see epoch time limits for both values.
Additionally - you should have a _time field. It's present for all events and is the date/time of the event that you see. Try using | eval time=_time to see values represented in the variable 'time'.
Also ... if I understand correctly what you are trying to report - "the minimum and maximum timestamps for the results of the search query" - you can use | eventstats max(_time) as maxtime, min(_time) as mintime to populate the min / max _time values present in your query results data.
Sam
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