You can change the 'time out' setting that displays the chat window to visitor, waiting for a contact's reply.
On your iPad, touch the top middle of the home screen of your Receptionist app for about 6 seconds. The active area you need to touch and hold is highlighted in red:
You'll see the account menu pop up:
Press "Device Settings" and you'll be prompted for your password. Once you enter your password and confirm, you'll see a new screen that includes the Visitor Timeout setting - this is local to each device.
Hit the < button in the upper left to return to your settings screen and save your changes.