You didn't mention what kind of export you are doing. Are you doing a user by user export or is this a full export? Are there partitioned tables involved? Are you doing the export while users are on the system? Have you tried exporting without constraints and then doing a separate export of just the constraints (i.e. no table data, etc)? Also check your OPTIMIZER_MODE paramter. At one time there was a MetaLink note about slowness on exports if OPTIMIZER_MODE = FIRST_ROWS. Another thing to check is to make sure your statistics are current. Having "bad" statistics may also be a problem.
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