Here are a few of options:
1. Go to File > Send to > Microsoft Office Word. This allows a side-by-side
view of the speaker notes and slide
2. Go to View > Master > Notes Master. Click on the slide graphic and drag
to make smaller. Click on the Text Placeholder and drag to make larger. You
can also do this to individual slide notes -- without changing the master
3. Duplicate the slide with the long notes. In Notes Pages view, delete the
"extra" text on the first slide. On the second slide, delete the text that
appears on the first slide. Now - Hide the second slide so it won't appear in
the Show but will allow the notes to be printed.