The length of a spec screenplay should always range from about 90 pages to 120 pages depending upon the genre. Anything longer than 120 pages, and the screenwriter is entering dangerous territory, particularly if you’re a new screenwriter. Many A list screenwriters are given more room to create what they want to create in terms of the length of their screenplays. Until you become a “box office” screenwriter, a good rule of thumb to follow for screenplay length is to keep it around 110 pages maximum, and you’ll be all right.
Donald L. Vasicek
Olympus Films+, LLC
The Zen of Writing
http://michaelc.nextmp.net/wordpress
dvasicek@earthlink.net