A 'Long' is an variable that can store larger integer values than an 'Integer' variable. In more recent versions of Office, 'Integer' variables are actually stored in memory as Long variables. What this means is that a type conversion is required to convert 'Integer' variables to/from Long variables each time they're used. That type conversion has a small processing overhead.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]