Movie first. I really don't know how long the extras are. I remember there is a documentory on it and it's great. They go further into it and even show the real video of Oswald's murder, which oddly wasn't used in the film to my knowledge.

http://www.dvdfile.com/software/review/dvd-video_7/jfk_se.html

45 minutes of deleted scenes sound good enough? I'm sure there's others too but I'm too lazy.