Possible Clues:

• "... long, long ___"
• "Give it ___!"
• "Four score and seven years ___ . . ."
• It may appear after a long time?
• "Long ___ and far away . . ."
• In time gone by
• "Long ___ and far away"
• ''A long time ___ in a galaxy far, far away''
• Fourth word in the "Star Wars" intro
• ''Long ___, in a galaxy far ...''