AUDIT sql command question

RE:
---------------------------------------------------
AUDIT
Purpose
Use the AUDIT statement to:

Track the occurrence of SQL statements in subsequent user sessions. You can 
track the occurrence of a specific SQL statement or of all SQL statements 
authorized by a particular system privilege. Auditing operations on SQL 
statements apply only to subsequent sessions, not to current sessions. 
Track operations on a specific schema object. Auditing operations on schema 
objects apply to current sessions as well as to subsequent sessions. 
---------------------------------------------------


No where in the docs does it state how far into the past the audit trail keeps 
a record of what happened to the database object being audited.

Does anyone here have an idea?

Thanks.

--
Lyndon Tiu
--
http://www.freelists.org/webpage/oracle-l

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