One of the chief considerations in recording an answering machine greeting is your audience. Who will be listening to your answering machine or voicemail salutation? Is this a business line or a home phone line? Furthermore, just how much information do you want to give out to potential strangers, like telemarketers, who may be calling your home? Long answering machine greetings may be inconvenient for callers.
Length – if your callers typically wait 2 minutes at a time, then at least 2 minutes of programming should be the goal. The idea is to ensure the callers don’t hear repeated messages every time they call. A typical on-hold message is 4-8 minutes in length.

Your business depends on customer engagement, and voicemail messages are a large part of that engagement. A voicemail is nothing more than a digital recording system, where messages are stored for you to retrieve later. Voicemail allows you to be able to connect with customers while you are away or during your off-hours, where they can drop off a message while you are gone. A voicemail greeting, on the other hand, refers to the message that your callers hear upon answering the phone.
Website: https://www.onsip.com/voip-resources/smb-tips/10-sample-call-center-greeting-scripts