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>>The tuning advisor does not run on SQL Express. I have the standard version of SQL 2012, do you think there'll be much difference if I do this in that version?
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>I'd run the query as-is in SQL 2012 to get your baseline, then run the tuning advisor.

Thanks. I got it to run and followed the tuning advice and the query has gone from over 30 seconds to about 6.