Users often don’t invest enough time into their messages, resulting in incomplete, unprofessional, or otherwise under-whelming greetings. Sure, crafting a greeting doesn’t sound all that complicated; however, there are a number of pitfalls users can fall into—i.e. informality, terseness, sincerity, lack of direction, and more. While none of these sound too catastrophic, they are often interrelated. As such, they tend to worsen any problem. For example, humor can cause informality, worsen ambiguity, and weaken sincerity. That being said, users should strive to avoid ALL these pitfalls.
If your business is off for a holiday, it's a common courtesy to update your voicemail to acknowledge the closure. Mention the closure in the beginning of the message, convey when your business is reopening, and don't forget to wish the callers a happy holiday if the occasion calls for it. If you're away from your office, check your voicemail remotely to keep up with incoming messages if necessary. Or get voicemail to email capabilities set up on your phone system. Thank you for calling Merlow Plumbing. We are closed for Christmas from December 24th, 2015, until January 2nd, 2016. Our normal business hours are Monday through Thursday, 8 am - 6 pm. Please leave your message after the tone. Have a happy holiday, and we look forward to seeing you in the New Year. 5. Emergency Situation Voicemail Greeting

Here, the pet care company leaves multiple options to fulfill the needs of the callers. They also have the option for attending to callers with immediate needs.
Don’t be too hard on yourself. Chances are, that voicemail that you’ve recorded and deleted thirty times has been just fine. Your main goal is not to get in the way of the caller leaving a message, which is exactly what can happen if you overthink it or drone on too long.