Bhiley,
Yes, there are limits in splunk, which you may be hitting up against. See, in your search you are telling Splunk to RETURN all of this data and not just count it.
Splunk has many analytic features, such as "stats" that have arguments like count.
You probably want to do something like this:
search = index=tal | stats count
If you want to be sure to just run this for the previous day you can use the timepicker in the search or do this:
search = index=tal earliest=-24h@h latest=@d-1s | stats count
If you had multiple indexes you can do ... | stats count by index
Find more about stats here: http://www.splunk.com/base/Documentation/latest/SearchReference/stats
Best,
Sean
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