On a computer, open Google Calendar with an eligible work or school account. In Settings → General, find Working hours or Working hours & location, depending on your organization. Enable working hours and select the days you want. If the option is absent, your administrator may have disabled it.
Add a second period for the same day
For a regular Tuesday with a break at noon, set 09:00–12:00 and add 13:00–17:00. The periods describe a weekly pattern. Check the calendar’s time zone and verify the times on Tuesday rather than copying them to every day by accident.
Check the scheduling signal
Ask a colleague who can schedule with you to compare 12:30 and 14:00 in a draft invitation. The first falls outside the hours you entered. Working hours show availability during scheduling. For a specific absence where you want Calendar to decline meetings, use an out-of-office event and review its decline settings.