This really depends on the situation. If you are completing a task for someone and you expect them to be waiting for your response, then you should reply as quickly as possible. On the other hand, if it is a casual conversation, it is generally polite to give the other person some time to respond so they don’t feel pressured.
A good rule of thumb is that if a response is expected within a short amount of time, such as a few hours, then you should reply quickly. If a response isn’t required right away, such as a few days, then it’s okay to take your time.
Ultimately, consider the situation and respond in a way that respects the other person’s need for time while also conveying your interest in the conversation.
