The appropriate time intervals for wishing "good morning," "good noon," "good evening," and "good night" can vary depending on cultural norms and individual preferences. However, here are some general guidelines:
Good Morning: Typically, you can wish someone "good morning" from the time they wake up until around 12:00 PM (noon). After noon, it's more common to use different greetings.
Good Noon: Wishing "good noon" is not as common as the other greetings, and in many cultures, it's not used at all. However, if you want to use it, it would be appropriate to do so around 12:00 PM.
Good Evening: You can say "good evening" from around 5:00 PM or 6:00 PM until around 9:00 PM. After 9:00 PM, it's more usual to say "good night."
Good Night: This greeting is typically used to say goodbye or to wish someone a restful night's sleep. You can say "good night" from around 9:00 PM until the next morning when you want to greet someone again with "good morning."
It's important to note that these time intervals are not rigid rules but rather general guidelines. Different cultures and social contexts may have variations in when these greetings are used. Additionally, people's individual schedules can differ, so it's always good to be sensitive to the specific situation and the preferences of the people you are interacting with.