Hi Sam! I’m glad you asked because I’ve been wondering the same thing. There’s no wrong way to do Morning Pages, so there’s room for us to adapt.
Somewhere in ch. 5 (I think) I stumbled upon Cameron’s thinking that we knock the junk out of our head after about 1.5 pages. Perhaps another 1.5 gets to the good stuff?
While the measurement is a little different for me, I can feel the shift happen from gunk to glory → as in material I can use that I might publish.
This link contains Cameron’s thoughts on three pages. Enjoy: https://juliacameronlive.com/2012/09/20/morning-pages-why-3-pages/