For Teacher Absent from School
Select every hour you will be AWAY from the school.
For example, if you're arriving at 9am, select 7am AND 8am (since you will be away from 7am to 8am plus 8am to 9am)
To select more than one hour, choose "Add a time..."
Only one person can be away for the selected hour. If the time is not displayed when you try to book an appointment, it means someone else is already absent.
For All day away
Select every day you will be away all day (e.g. Vacation day)
Only need to select the start time. it will always be 7:30am
To select more than one day, choose "Add a time"
Only one person can be away for the selected day. If the day is greyed out, when you try to book an appointment, it means someone else is already away.