Work hours
Open Settings → Work Hours. Mark working days and set one or more non-overlapping start and end intervals. Changes save as they are made. At least one work day is required, and every end must follow its start.
Use blocked time for all-day date ranges or one timed interval, with an optional description. Blocks remove availability; they do not add working hours.
Work hours and blocks control Schedule shading, suggested encounter times, and next-available-slot calculation. They are guidance, not a hard booking rule: the date-and-time picker can still choose an outside time.

