Want to upgrade RAC 10.2.0.2 database (2 instances) to 10.2.0.5. DB size is 4 TB. Contains mostly .pdf files, reports. I do not have test/upgrade environment. How much time I can expect it will take?

Want to upgrade RAC 10.2.0.2 database (2 instances) to 10.2.0.5. DB size is 4 TB. Contains mostly .pdf files, reports. I do not have test/upgrade environment. How much time I can expect it will take?
How much the upgrade process depends of database size, in this case?
I have fast boxes IBM AIX 5.3 , 64 b.

Appreciate your comments ...
Yes, sound stupid, regarding test environment, but in reality, is not that much:
-I do have "preprod" environment, (2 instances RAC) same releases of OS, OCW,RAC ... but DB size is 40 GB!!! It has all the objects as production, but (again but) it does not have physical standby, as production has. This is not that unusual, knowing that production DB grows very fast, and very large, and business do not want to keep preprod, dev, test databases same HUGE size as production is. Savings ...
-My DB upgrade depends if application running on top of it is certified for higher RDBMS release ... looks like they have some problems.
-Very encouraging sounds comment that DB upgrade does not depend that much of the DB size ...
- i do not recall from where this info came, but I have heard that R 11.* treats PDF files in different way that R10 did it ... and because of that, process of upgrading big databases which have many items of that type (pdf) can take very long. Any idea about this?
-Brian, thx ... I'm trying hard to provide DB simmilar size in UPG environment and face all possible pitfalls before I go in production...thx for youe advice. I'm relly interested in how upgrade to 11.* from 10.* traets my pdf-s ... All my TBs comming from pdfs. Everi advice will be wellcome ...

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