Education Details: Answering Machine Messages (With Examples) - Zippia. A simple message that instructs them they will receive a callback and how they can contact you if it is an emergency will suffice. Too much information can be a big turnoff and cause people to not want to engage with you further. An optimal time for a voicemail message is 25 seconds or less.
In a concise fashion, you should relate the hours your business functions, and note any potential conflicts such as holidays or business closures. Use an auto attendant if you have more than one menu option for the customer, such as a voicemail box and an emergency support line.

One way to avoid this is by writing a script. When you’re writing a script for your business voicemail greeting, make sure to look over it to see if there’s any slang or business jargon that could mean two different things depending on your point of view. If there’s any potential for confusion, revise the script and simplify the language. You can always ask a friend you don’t work with to see if your message is clear as well.
Whenever you call someone and their voicemail greeting is playing, it tells you a lot about who they are, as a person. Which is why, you’ve got to put a little bit of “you” when it comes to voicemail. And the best part about all of this is, since you couldn’t come to the phone, at least the callers are having a good time listening to the message.