Conversation so far:
when was all about eve developed?
The story of All About Eve originated in an anecdote related to Mary Orr by actress Elisabeth Bergner during 1943 and 1944.
what was the anecdote related to Mary Orr by actress Elisabeth Bergner that originated the story of All About Eve?
While performing in The Two Mrs. Carrolls 1943-1944, Bergner allowed a young fan to become part of her household, regretting her generosity when the woman attempted to undermine her.
why did Bergner regret the generosity she showed the young fan?
In the story, Orr gives the girl a more ruthless character and allows her to succeed in stealing the older actress' career. Bergner later confirmed the basis of the story.
how did the young fan try to undermind Bergner?
The girl is a more ruthless character and steals the older actress's career.
who was a part of the development of the film All About Eve?
In 1949, Mankiewicz was considering a story about an aging actress.
was anyone else involved in the development of the film All About Eve besides Mankiewicz, Elisabeth Bergner, and Mary Orr?
Mankiewicz sent a memo to Darryl F. Zanuck saying it fits in with an original idea [of mine] and can be combined. Superb starring role for Susan Hayward.“
were there any problems with development of the film All About Eve?
Zanuck was enthusiastic and provided numerous suggestions for improving the screenplay.
did the screenplay for All About Eve need to be rewritten?
Zanuck reduced the screenplay by about 50 pages and chose the title All About Eve from the opening scenes, DeWitt tells more of Eve ... All about Eve, in fact.“

Question: how many was it before?
Self-contained rewrite: how many pages was the screenplay for All About Eve before Zanuck reduced the screenplay by about 50 pages?