Good afternoon time: Saying

Saying " good evening" is appropriate after 6 PM, while saying " good afternoon " is used from 12 PM to 6 PM. If you take 24 and divide it by 3, which is Morning, Afternoon and Evening, you would get 8 hours. So each time of day lasts exactly 8 hours. People say, " Good evening," when you greet someone in the evening. Do you still say, " Good evening," when you meet someone after twelve midnight and before dawn? In Japan, professional musicians and other entertainers always say, " Good morning," regardless of time . Is this the same in English-speaking countries? " Good afternoon " is typically used from around 12:00 PM to 5:00 PM as a greeting.