hello @cdgill,
try and run the search in verbose mode and look at the icons to the left of the fields: job_duration, queue_time and test_summary.duration as well as other fields that you eval.
check if they are numerical "#" to the left or string "@" to the left.
i assume one (or more) is a string and therefore can not be calculated with arithmetic functions.
if thats the case, use: eval num_field = tonumber(string_field) or other way and then run your last calculation
hope it solves it
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