I think it would be a good idea when booking a patient into an appointment slot that the duration selector gives the time available in the slot and not 8 Hours!
Mistakes are being made by members of staff selecting the 8 hours which can close off the diary for a whole afternoon. It has happened to us. The clinician asked what had happened to his diary in an afternoon a couple of weeks ahead and why was it closed off. It took us all ages to work out it was a miscellaneous slot that had a duration of 8 hours
It would also be helpful and quicker for the staff member making the appointment that he/she knows how long there is in the slot and not just 8 hours.
Difficult to explain but I hope I made it as clear as possible.