Editing aiff file with QT. Help needed.

Hi Everyone-

I have a three hour long .aiff file that I recorded. I know how to open Qucktime and manually cut the file into 3 one hour segments and then export those segments as a MPEG4 file that I can later import into iTunes for burning to disk. I think the following would export the file correctly:

tell application "QuickTime"
    export sound_file as MPEG4
end tell

Or something to that matter. What I need help with is a script that will tell Quicktime to cut the .aiff file into 3 one hour long segments and then export each segment as a MPEG4 with a specific title + part number. I then want to add onto the script to allow iTunes to import each segment with their respective info.

Any ideas?