To find out for yourself do something like this:
1. run your query.
2. set a start time variable using gettickcount().
3. set up a loop from 1 to a million.
4. run through the query using cfoutput.
5. after the closing cfloop tag, set a stop time variable
using gettickcount.
repeat steps 2 to 5, but using cfloop in step 4.