mmmhhh... large enough to store at least as many data blocks you expect to pin into memory and at the same time small enough not to cripple your system :-)
How could we know if we know nothing about your system?
By the way, be sure you understand exactly what you are doing when defining KEEP buffer cache. I have seen this backfiring.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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