Keep it Brief. Time is money in business, so if your voicemail is long, chances are the caller will simply disengage before the cue to leave a message even sounds. Keep your voicemail short. The most should be around 30 seconds, and even that’s pressing it. We’ve grown into a country where our attention span can last only about 10 seconds in some cases, so keep it short, brief and to the point. Persuade and Engage the Caller. If someone calls your business, they already have an intention. It’s the quality of your voicemail that plays a factor if they consider you a company they’d like to deal with. This is your chance to motivate someone to engage in a meaningful conversation with you. If your voicemail is shoddy, chances are they’ll hang up, or lose motivation to continue the call. In other words, your voice mail must engage and entice someone to the point that they care enough to leave you a message.
12.) Bienvenido/a a John Doe. Puede contactar con nosotros de lunes a viernes de 8:00h a 12:30h y de 13:00h a 16:30h. En estos momentos no podemos atenderle personalmente. Por favor, deje un mensaje con su nombre y número de teléfono y le devolveremos la llamada tan pronto como sea posible. Para casos urgentes puede contactarnos al teléfono 0821 91039- 1211. Muchas gracias.

Gosh. You are what positive, confident energy is. Do you? Will you have a how to on leaving a voice greeting for the client who would be contacting the businsess, or the executive, sales, or manager personal cell phone?
Expanding on the simple approach above, let the caller know who they've reached. This will not only eliminate people leaving voicemails by mistake, but it will reassure the caller that they have called the number they intended.