According to this chart, I single indexer should be enough for the volume of data. A lot depends on the number of searches being run, however, something Splunk's chart tries to capture in the "number of users" figures. If you have fewer than 24 users, but still do a lot of searching then it may be worthwhile to add an indexer or two. Once the data is re-balanced among the indexers, each will perform a fraction of the work and the search should complete in a fraction of the current time. Also, consider adding a sourcetype specifier to the base search as that can help improve performance.
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