You may have a user who needs a different amount of time to carry out an appointment to the one that the appointment is set to. E.g. You may set an eye exam to be 30 minutes, but your pre-reg optometrist may need 45 minutes. In order that the correct amount of time is blocked out for the pre-reg, without users having to manually alter appointment times, you can create custom appointment lengths:

In the users tab in the maintenance module.

Click custom appointment durations button.

Select the user who needs the adjusted appointment length from the drop-down list.

Select the appointment that needs adjusting from the drop-down list.

Type the new appointment length into the end box.

Click add