A knowledge base article about How do I set bCal to only show my work hours? provided by the UC Berkeley IT Service Hub - Knowledge Portal
You can set your working hours in bCal to show when you work and what times you’re available for meetings and events. You can also show when you're out of the office.
To automatically warn people if they try to schedule a meeting for a time when you won’t be working, you can turn on working hours. You can only turn on working hours from a computer, not from the Google Calendar app.
Calendar might suggest working hours based on your time zone, working patterns in your country, and your schedule. You can accept, decline, or edit these suggestions.
When you indicate you’re out of office, your calendar will automatically decline all meetings during that time.