Related Clues:

• "See ya!"
• Time beyond measure
• 'Peace!'
• ''So long!'' in London
• ''Bye!''
• Breezy farewell
• Just about forever
• Extremely long stretches
• Sheffield farewell
• Indefinitely long periods of time
• ''Ciao!''
• Geologists' times
• Many, many millennia
• Big stretches
• Immeasurably long periods of time