Status durations are calculated according to the working calendar you have.
By default, the app comes with two calendars.
7/24 Calendar: There is neither daily breaks nor holidays defined.
Weekdays 9:00-18:00: As the name implies, it excludes Saturday and Sunday and takes 8 hour of working schedule with 1 hour lunch break. The timezone is set to Europe/Berlin.
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3. Configure working calendar
You can modify the existing calendars or add your own via the Calendars admin page.