[Cass]

The pages will almost certainly be based on word count. I believe the standard is 150 words/page.

Word count is probably the best measure to base this on, because time spent reading is totally arbitrary and depends on external variables, like how fast a reader the buyer is, how distracted they are while reading, and how difficult the text is. Personally, I'd think it makes more sense to pay us per 1000 words of text read, but if they want to call 250 words of text a page, that essentially accomplishes the same thing.