Any way to avoid the hit on the TEMP tablespace?

I'm running a CTAS query that unions 13 tables with about 7,000,000 rows each, inner joins that union again against a global temporary table with 13 rows, and then doing a GROUP BY against the result, summing about 6 fields. The resulting query runs in about 2 hours with about a 16 Gig hit on the TEMP tablespace.
In production I will need to join 52 tables with about that many rows against a GTT with 52 rows. I haven't experimented with it yet but I'm guessing the time and memory increase will be linear (i.e. 8 hours, 64 Gig hit).
I'm being asked if there's any way to avoid the hit on the TEMP tablespace. It was suggested that I look into using a materialized view, but won't that just transfer the hit from the harddrive to the RAM? I don't think this particular database has 64 Gigs of RAM dedicated to it, and I'm sure the row counts will grow in the future anyway.
Thoughts?
Thanks
Joe

I don't have visibility to the TEMP tablespace on their database so I don't know if the hit there is any less.
If you have privileges you can use SQL*PLUS autotrace (or possibly Oracle trace, if you're really that interested) to get run-time statistics on a query as you run it. Waiting for the 2-hour results will be a bit tedious though. If you don't have privileges for autotrace it won'r work; the error messages explain what's wrong rather well ;)
SQL> set autotrace on
SQL> select * from dual;
D
X
Execution Plan
Plan hash value: 3543395131
| Id | Operation         | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |      |     1 |     2 |     2   (0)| 00:00:01 |
|   1 | TABLE ACCESS FULL| DUAL |     1 |     2 |     2   (0)| 00:00:01 |
Statistics
          1 recursive calls
          0 db block gets
          3 consistent gets
          2 physical reads
          0 redo size
        204 bytes sent via SQL*Net to client
        234 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          1 rows processedI still haven't figured out why selecting from dual is doing 3 consistent gets and 2 physical reads ;)

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