How many Hash Partitions do I need?

Is there a general rule, guideline or best practice that I can follow to derive the optimum number of hash partitions I should create for a table to be hash partitioned?
I see that oracle recommends to consider partitioning if the table exceeds 2GB, so should I attempt to limit the size of the partitions to 2GB?
Why is this recommendation based on number of bytes vs. number or rows? It seems to me that a 100m row table should be consdidered for partitioning regardless if it has 1gb of data or 5gb of data. Please advise as to why the number of bytes is consdered a key factor vs. number of rows.
-Pat

Thanks for the response. Actually I currently have a table with 1.1 billion rows and growing daily. This table is currently hash partitioned with 8 partitions. I'm thinking we should go to 64 partitions, but I really don't have any information for which to base this on other than a gut feel. Based on the access patterns for this table I do not believe that there is any real downside for creating 64 partitions, but before having the customer take the down time to go to 64 partitions it would be nice to have some basis for justifying the 64 partitions.

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