Hi David - depending on whether you are hoping to summarize the results by an employee attribute (e.g., Average weekly meetings by employee's organization) or meeting attribute (e.g., Average meeting attendance time by meeting organizer's organization), you can use either a Person Query or a Meeting Query to create this custom analysis. A Person Query will give you metrics for each person by day, week, or month, and a Meeting Query will give you metrics for each meeting.
You can find more information about creating a custom Person Query here: Person queries in Workplace Analytics | Microsoft Docs
I would recommend starting with creating a custom person query, summarized by week, and adding the following metrics:
You can summarize the results of this query to get the average weekly number of meetings attended and time spent in meetings per person. You can include organizational attributes to group the results by organization, etc. If, after running it, this seems to be what you need, you can open and edit the query to create an alternative version summarized by day or month.
You can find information about creating a custom meeting query here: Meeting queries in Viva Insights | Microsoft Docs
I would recommend creating a custom meeting query with the metric "Attendee meeting hours". This will give you a list of meetings, and for each meeting, how much time it consumed from attendees (attendees x time). When you add organizational data to the meeting, you can include organizer attributes (e.g. meeting organizer's organization) as well as meeting attributes such as Subject (if allowed by your instance's privacy configuration).
I hope this helps you to get started!
