Usually from 5 PM till 11:59PM. If you want to be specific you could start saying it at 4PM if for example you are at work and want the customer to leave.
from 5pm till 8pm
You would say 'good evening'
good evening
To say "good evening" in Tagalog, you can say "Magandang gabi."
Good day can be said any time during daylight hours. You can also say 'good morning' in the morning or 'good afternoon' in the afternoon or 'good evening' in the evening. However at night you may not say 'good night' unless you are going to bed. As a greeting at night you should rather use 'good evening'.
You can say "Good evening" in Farsi as "Asr bekheir" or "Shab bekheir."
In Maori, you can say "morena" which means good evening.
"Good evening" in Ilocano is "Naragsak nga rabii."
You say Good evening in Kisii language of the African origin as Bwairire.
To say 'good evening' in French you say 'bonsoir'. This is pronounced as 'bon swor'.
The Hawaiian translation for good evening is aloha ahiahi.
In Cebuano, you can say "Maayong gabii" to greet someone "good evening."