1. a long period.
2. six years.
3. 1995 .
4. six weeks
5. eight months
6. the beginning of the year.
7. a long time .
8. ages .
9. March 18.
10 the end of last year.
11 I joined the firm.
12. ten hours.
13. ten o'clock.
14. ten minutes .
15. a six month period.