It's impossible to give a definitive answer to "how long does Twilight New Moon last" because it depends on what you're asking about:

* The book: "New Moon" is the second book in the Twilight Saga by Stephenie Meyer. The book is approximately 371 pages long. How long it takes to read it depends on the individual reader.

* The movie: "The Twilight Saga: New Moon" is the second movie in the franchise. It is 130 minutes long.

* The actual new moon phase: The new moon phase is a specific point in time, not a duration. It lasts for a moment when the moon is directly between the Earth and the Sun.

Please clarify your question to get a more specific answer!