The Internet is asynchronous. There are some synchronization capabilities. However, messages have to be sent, received, and responded to. Bandwidth determines how synchronous real time applications perform.
It is proper netiquette to send messages within an appropriate time.
In general, the recipient of a message has a choice of when to respond if at all. Response is not required. A late response is similar to no response at all in most cases.
Messages are time sensitive. Circumstances change. A late message is one that is no longer relevant.
There are varying response times depending on the person and type of message being sent or received. Professional messages have priority over personal messages.
Earning a living is more important than personal circumstances in principle. Family may take precedent in some cases. Prioritization is part of replying in a timely manner.
Published on February 18, 2014 1:33 Minutes
The principles of prioritization motivates messaging. They tell us how to do it. The conventions for sending them that may be altered by the principles.
The hours of 10:00 PM to 6:00 AM locally are generally considered sleeping hours. Sending messages during this time period is not appropriate because recipients are typically asleep.
Responding to a professional message within 24 hours of reading it is appropriate. Professional messages deserve a response appropriate for the message received. Some messages may require a faster response time.
Send messages within an appropriate time based on the content of the message.