Set the timing for email and SMS reminders.
Normally, a reminder is sent via SMS or email 24 hours before the appointment. However, you can adjust the reminder time yourself.

Changing this value will cause new appointments to be reminded by default at this interval. Existing appointments that have already been entered will retain the reminder time that was set before the change.
Recommendations for reminder period
If you have special cancellation rules, you can adjust this time. Sometimes customers only realize through the reminder that they cannot attend the appointment. If you only allow cancellations within a certain time period (e.g. up to 24 hours before an appointment), it makes sense to set a larger reminder period, e.g. with 48 hours notice.
Sending time window
Please note that there is also a 24-hour sending time window. This means that if an appointment is created within the set reminder period, an SMS is sent immediately upon appointment creation.