At the moment the calendar will not buffer after a non GHL and before a GHL.
Ex. non GHL 12-1 the system will allow an appointment to be book right at 1.
It would be great if you could determined a before event and after event buffer.
ie in the above scenario if you had a buffer of 10 min prior you GHL would read the non GHL event and not allow a booking to until 1:10