Here are the correct greetings for each time:
1. 18:20 - Good evening
2. 20:30 - Good evening
3. 07:20 - Good morning
4. 06:30 - Good morning
5. 02:50 - Good morning
6. 11:30 - Good morning
7. 06:00 - Good evening
8. 17:00 - Good evening
9. 15:00 - Good afternoon
10. 22:00 - Good night