The Freshchat widget, also known as the conversations widget, is used to deliver a convenient and contextual conversational messaging experience for customers. 

With Freshchat, you can let your customers know your availability by setting up Business Hours. You can configure an Away message which will be auto-replied to your users if they initiate a chat during your offline hours. The Away message can be customized. For example, it can say, “We are currently offline, please drop a line and we’ll get back to you once we are back.” or “We are available from 9 AM to 6 PM PST, leave a message and we’ll get back to you asap.” This will help set the right response expectations with your customers.

Chat messages accumulated over your non-business hours will be available in the New view in the Team Inbox. Agents can pick up and start responding to messages from here the next day. Or you can set up Assignment Rules to route these conversations to a custom view/group/agent. 

You can also enable email notifications for your customers, which will notify them when you reply to their message, by sending them a link to the conversation as an email. You can also enable email notifications without configuring business hours.

To hide the web messenger during your offline (non-business) hours, you can use the below code snippet:

<script src="https://snippets.freshchat.com/js/freshchat-business-hours.js"></script>
  <!-- All the below time stamps are in GMT. This is done in order to have the script work across all regions -->
  <script>
    var business_hours_config = {
      "Sunday": {
        from: '03:30 AM',
        to: '11:30 AM'
      },
      "Monday": {
        from: '03:30 AM',
        to: '11:30 AM'
      },
      "Tuesday": {
        from: '03:30 AM',
        to: '11:30 AM'
      },
      "Wednesday": {
        from: '03:30 AM',
        to: '11:30 PM'
      },
      "Thursday": {
        from: '03:30 AM',
        to: '11:30 AM'
      },
      "Friday": {
        from: '03:30 AM',
        to: '11:30 AM'
      },
      "Saturday": {
        from: '03:30 AM',
        to: '11:30 AM'
      }
    };
    window.fcSettings = {
      onInit: function() {
        fcBusinessHours.initBusinessHours(business_hours_config);
      },
    };
    window.fcWidgetMessengerConfig ={
      config: {
        cssNames: {
          //The below element is mandatory. Please do not modify this.
          widget: 'custom_fc_frame',
          //The below element is mandatory. Please do not modify this
          expanded: 'custom_fc_expanded'
        }
      },
    }
  </script>
  <script src='//fw-cdn.com/1*****7/2*****4.js' chat='true'></script> 

Note: Navigate to Admin Settings > CRM Tracking Code > Integrate your website > Copy to get the widget code.