RMAN duplication and expiration of the directives on the environment of data warehouse

Operating systems: Windows Server 2008
DB: Oracle 11 g 2

Are there guidelines how often one should do a RMAN duplication and assign an expiration on archivelogs for data warehouse environments?
It me appears once a day would be enough for overlapping in a data warehouse environment which is updated nightly. Expiration, I don't expect less than 1 week.
See you soon!

I agree with damorgan

See the links for the best practices below.

http://www.Oracle.com/technetwork/database/features/availability/311394-132335.PDF
https://blogs.Oracle.com/Datawarehousing/entry/data_warehouse_in_archivelog_m

Hope this helps,

Concerning
http://www.oracleracepxert.com
Understand the power of the Oracle RMAN
http://www.oracleracexpert.com/2011/10/understand-power-of-Oracle-RMAN.html
Duplication of data base RAC with RMAN
http://www.oracleracexpert.com/2009/12/duplicate-RAC-database-using-RMAN.html

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