Long estimate times when exporting with EXPDP

Hello Everyone,
I have a few questions about using EXPDP. I'm running Oracle Database 10g Enterprise Edition Release 10.2.0.1.0.
I'm trying to understand whether or not the export times I'm seeing are reasonable. First, I am performing a SCHEMA export, excluding users, grants, roles, statistics, and several tables. When using block estimation, the following operations take 10 minutes to complete for a single schema:
6/7/2010 12:39:39 PM: Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
6/7/2010 12:49:12 PM: Total estimation using BLOCKS method: 512 KB
6/7/2010 12:49:13 PM: Processing object type SCHEMA_EXPORT/TABLESPACE_QUOTA
6/7/2010 12:49:14 PM: Processing object type SCHEMA_EXPORT/TABLE/TABLE
10 minutes seems completely unreasonable for 6 tables composing so little data. The 10 minute times appears to be constant regardless of the data size. For example, another schema (with about 30 tables) produces the following output:
6/7/2010 12:10:52 PM: Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
6/7/2010 12:20:33 PM: Total estimation using BLOCKS method: 16.08 GB
6/7/2010 12:20:35 PM: Processing object type SCHEMA_EXPORT/TABLE/TABLE
6/7/2010 12:20:36 PM: Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX
Also in about 10 minutes! I wouldn't expect these times to be so close for about 100000x more data! Why does the estimate take so much time? I would expect the block estimate to be a simple calculation over data the DB server is already keeping around.
When using estimate=statistics, the behavior is even stranger. In this case, the "Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA" operations all take ~17 minutes (regardless of the volume of data in the schema), and the actual export lines in the output (". . exported "test_schema"."table_a" 5.056 MB 5782 rows") complete very quickly (< 2 secs).
Is this kind of behavior expected?
To collect these times, I wrote a small application that kicks off expdp and reads the output along with a timestamp one line at a time. If the tool is buffering it's output, that might explain some of this, though for the block estimate, I see the following output during the table exports, which seems reasonable:
6/7/2010 12:20:47 PM: . . exported "test_schema"."table_a" 2.332 MB 915 rows
6/7/2010 12:22:58 PM: . . exported "test_schema"."table_b" 954.8 MB 32348 rows
6/7/2010 12:23:59 PM: . . exported "test_schema"."table_c" 975.6 MB 60573 rows
6/7/2010 12:24:38 PM: . . exported "test_schema"."table_d" 553.8 MB 973 rows
6/7/2010 12:24:56 PM: . . exported "test_schema"."table_e" 159.6 MB 2562 rows

The command:
expdp 'schema/********@server' estimate=blocks directory=DATA_PUMP_DIR dumpfile=8be7d007-e6c1-4e10-8164-db27d9fce103.dmp logfile=8be7d007-e6c1-4e10-8164-db27d9fce103.log SCHEMAS='schema' EXCLUDE=SCHEMA_EXPORT/USER,SCHEMA_EXPORT/SYSTEM_GRANT,SCHEMA_EXPORT/ROLE_GRANT,SCHEMA_EXPORT/DEFAULT_ROLE,SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA,SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS,SCHEMA_EXPORT/TABLE/COMMENT,SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
The new output:
6/7/2010 4:22:19 PM: Estimate in progress using BLOCKS method...
6/7/2010 4:22:19 PM: Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
6/7/2010 4:29:48 PM: . estimated "schema"."table1" 11.89 GB
6/7/2010 4:29:48 PM: . estimated "schema"."table2" 1.298 GB
6/7/2010 4:29:48 PM: . estimated "schema"."table3" 1.041 GB
Judging by the output, I'm guessing that expdp is buffering the output and my tool is reading it all at once, such that each "estimated" line has nearly the same time. Is there a better way to to timing information from the estimation?
Thanks for the help!

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