Try
Code:
Dim iRev As Long, Revisions_Count As Long
Revisions_Count = ActiveDocument.Range.Revisions.Count
For iRev = Revisions_Count To 1 Step -1
With ActiveDocument.Range.Revisions(iRev)
End With
Next iRev
The property "ActiveDocument.Range.Revisions.Count" is evaluated once before entering the loop
In your code, this property is evaluated 100 times on each loop.