Unless you're inserting them manually instead of using Word's referencing tools, updating an individual citation should be almost instantaneous, regardless of how many your document has - and pressing F9 should not be required. I'm not sure what you call a large number but testing on a document with 108 citations (all inserted via Word's referencing tools) and pressing F9 takes about 20 seconds to refresh all the fields.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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