Related Clues:

• 'Ciao!'
• Almost forever
• 'So long!'
• Ages and ages
• 'See ya'
• 'Cheerio!'
• Incalculable amount of time
• A long time
• See 37-Down
• Forever
• Going away statement
• Many ages
• Socialite's 'bye'
• A long, long time
• Stretch of history