Hi Rory,
You can set chat hours from within the Live Chat settings.
Note that there must be an entry for each day when checking the box to Configure the times.
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Hi @RoryW,
Are you using the Live Chat application with your server selected as 3CX or Standalone?
In Wordpress, once the Live Chat plugin is installed, it will present its own menu on the left hand side.
If I've misunderstood anything, feel free to clear this up with more detail and screenshots if you'd like.
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Hi, using 3cx. Installing on Joomla not Wordpress
The Customizable chat hours within Live Chat requires it to be installed on Wordpress. If you've installed it on Joomla, logging your agents out of the Live Chat queue in 3CX will create an offline message being displayed when a user opens the chat, if you've customized it to.Hi, using 3cx. Installing on Joomla not Wordpress

You will see the chat appear in the web client of the extensions which you've added to the Live Chat queue / extension which you've chosen as the Live Chat recipient.chat in 3CX - in messaging on left if that is what you mean ?
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.