We use Appointment Quest for our scheduler. It sends out the reminder email exactly 48 hours before the appointment. This gives some time for them to check their email and cancel or reschedule the appointment...hopefully in time for someone else to take the slot.
To be fair, the standard Updox reminder is actually superior to this since it allows you to select up to 3 reminders and to configure the timing (24 hours, 1 week, 4 hours) of them. I was hoping that Updox would simply add the ability to send the reminder by text message provided there is a cell phone listed for the patient.
Another issue is the Confirmation Request that Updox sends. This is sent as soon as AC uploads the appointment into Updox. I wish we could configure it for...exactly 24 hours before the appointment, unless the appointment is sooner than that in which case it is immediate.