Revenge of the Entish Bow: Started 1/08/2003, finished 4/18/2003 = approx. three months, ten days
Reunification of the Entish Bow: Started 7/09/2003, finished 5/11/2006 = approx. two years, ten months, two days
New Movie Script: Started 6/15/2003, still going 5/28/2006 = approx. two years, eleven months, eighteen days
This page of the NMS: 12/18/2004, still going 5/28/2006 = approx. one year, five months, ten days
Ladies and corpses, do we have a record?

Should we start "The Hobbit Script", or would that fall into oblivion worse than this has?
I know not where this should fit exactly, make of it what you will:
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Scene: Somewhere on the border of Rohan and Gondor
*Theoden and the army of Rohan gallop onwards, suddenly Theoden holds up his hand to stop*
Theoden: Hold it! Back up a few feet! (The army grumbles and wonders, but does so)
Theoden: Now ride forward a bit! (They do so)
Eomer: What are you doing, my lord?
Theoden: You don't hear that?
Eomer: Uh, what, the army muttering behind your back?
Theoden: No, listen!
*everyone does so*
Theoden: You honestly didn't hear? Back up again! (The army does so)
Theoden: Now forward. (They do so)
Eomer: My lord, time grows short, what are you talking about?
Theoden: You honestly don't hear that? Back up again! (The army does so)
Theoden: Back here, you can hear the Rohan theme, hardic fiddles and what-not, while here (The army moves forward again), it's trumpets and the theme for the White Tree of Gondor!
The Army: *stare*
Theoden: The theme music is switching! That means that we've passed over into the Realm of Gondor! I always loved going across the border when I was younger...used to drive my Dad crazy when I'd back the whole cavalcade up. Now here we go, to battle and a red dawn, ONWARD!
*The William Tell Overture plays, and the army gallops forward muttering to itself angrily*
Howard Shore: That man drives me CRAZY!!