Related Clues:

• Epoch
• Diamond stat.
• Stage of history
• Laundry room brand
• Questionnaire datum
• Roman or Greek, e.g.
• Long, long time
• Time of one's life
• One billion years, in geology
• Quite a while
• See 44-Across
• Significant time
• Proposal defeated in 1982
• Developmental period
• Many millennia