Answer:
This varies slightly and I'm not going to do a detailed breakdown here. What we're really talking about is 3-Act versus 4-Act structure. Too complex to debate by email.
Depends on whether your Hero has three core challenges and your story terminates at the Ultimate Boon or has four core challenges and the story terminates post the Crossing of the Return Threshold.
But even then it is not a question of how many pages each should be. It is more a question of ensuring that all the stages of the Transformation have been passed (to ensure that the process is complete). If you do that, then the pages will self-regulate.
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