User voicemail greeting (business vs closed hours)

Hi there. I've noticed my users will record a personalized voicemail greeting for their extension. However, because our phone system is configured for 'business hours' (or open hours), there will be a spot for 2 different greetings (a greeting that will be played during busines hours, and a different greeting to be played during closed hours).

Is it possible to change a setting so the same greeting is used regardless of the time of day? (Without changing the 'business hour settings').

Alternatively, could you easily duplicate a greeting so it can be used for both greetings?

Thanks.