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Time to complete an upgrade

How long do you think it would take one experienced DBA to prepare for and complete an upgrade for a 20 GB database from Oracle EE 8.1.7 to EE 9i R2? We plan to install 9i and then use the Upgrade Assistant. The platform is running on Windows 2000.
The experienced DBA who knows the system would know better than I would. It could take anywhere from a few hours to a day or two. Every install/upgrade is different and has many variables involved. Sorry to be so vague, but there's not really a valid way to put an exact estimate together without knowing anything more about the database and environment.
This was last published in March 2004

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