You've open a story and are forced to click to the next page after every sentence, how many pages till you say "no more" or have you quit?

It depends on how much I want to read the story or whatever. Generally, if there are more than 3 or 4 pages, I'll skip it, but, if there are 10 or more, I won't bother to look.

Zero. The first time I see that instruction, I exit the site.

There may be some usability testing on this. You could look it up. A lot of those clickbait things have pictures and headlines to intrigue the reader - "You'll never guess what these stars look like now!"

About 5. Then I say to h*ll with it and move on.