The length of breaks can be set when you create a New Event Type or edit a previously saved event type. Here is where to set breaks between meetings through your FreeBusy account:
Create new event type, or
Select a previously set event type from the drop-down box
2. Next scroll down though the event type configuration items to the 'How do you want to handle meeting proposals’ section. By default, there are no breaks or buffers set. Click on the button to expand the options.
3. Check ‘Prevent back to back’ box to expend the options.
4. Select the time increment and click the save button. Now you're all set for the selected event type. This setting is not global. You'd have to set the break / buffer interval for every event type. This allows for more flexibility in customizing your availability.