Howdy Ian,
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I think the screen I found allowed me to quantify what that 'significant amount of time' was. <!-/quote-!><hr size=0></blockquote>
Were you looking at the Note Duration adjustment dialog?
If so, it's in Piano Roll/Save and apply...(last button, 2nd level)/Edit note durations (only button, 3rd level.)
ttfn,
Sherry