“All night, if necessary. Anyhow, till they all go to bed.”
Gatsby doesn’t want to admit that his American dream is over and he can’t get Daisy. He thinks that if he waits, and finds that Tom and Daisy have a fight, he still has a chance of being with her. He’s waiting for Tom to mess up which is really unlikely as Tom is also quite desperate to keep Daisy.
To help improve the meaning of these lyrics, visit “The Great Gatsby (Chapter VII)” by F. Scott Fitzgerald and leave a comment on the lyrics box