A person can be willing to help while remaining practically unreachable. Office hours create a known opening in their schedule. Instead of negotiating a special meeting or interrupting other work, someone can bring a question to a time already reserved for that purpose.
The arrangement is familiar in teaching, but it can also suit a volunteer coordinator, experienced practitioner, or project lead. Its value is making access less dependent on confidence or an existing personal relationship.
For a first-time student, “office hours” may sound like the hours when a professor is busy working. Explaining what people may bring is therefore part of the arrangement. Usable times and ways of participating help make teaching accessible; a calendar entry alone may not reach everyone.
A repair-club organizer might offer an hour for volunteers to discuss unfamiliar tasks or propose an activity. Saying that unfinished ideas are welcome makes the invitation different from a final approval meeting.
The schedule can still exclude the people who most need help. A single afternoon slot may be impossible for someone working shifts; an open group room may be unsuitable for a private concern. Alternative ways to contact the host keep the published time from becoming a new barrier. Office hours work by lowering the cost of an approach, not by restricting all access to one window.