I agree that patients wouldn't properly determine the length of the appt. You simply don't let them. Both of these systems allow you to define appointment types that have the lenght of the appt. built in and should only fit in the open schedule slot of that length. At least I think they do.
If you can remove the choice from the patient to do what you don't want them to do(no CPE after 5, now First Visit after 5,
