If you need to hold office hours in these days of distancing, and your on-line meeting service has a “waiting room” feature, then you can create a recurring meeting for your office hours and send the access information to your students. Then start the meeting and admit your students one at a time from the waiting room to the office hours meeting, waiting for each to leave before admitting the next.

This same tip could be used if your job requires you to consult with a large number of your colleagues and you need some time for your own work.