As little as possible and as much as is required.
This really is a "how long is a piece of string" question.
How much your script uses depends first on what it has to do, then on factors like how fast your server is.
Your question is way too loose to get any useful answers.
The questions you should be asking your self:
Does the server ever become overloaded?
How long does the use have to wait for a page (excluding network time)?
How is this affected by the number of concurrent users?
Is anyone complaining?
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