Hey @daveh536, you can go into your Active Host reports at https://zoom.us/account/report/user. Once there you will see a Participants column, and within that column, you will see the number of participants that participated in your meeting. ⤵️
Once you click on the Blue Highlighted number, you will see something like ⤵️
From there you can determine the participants' duration within your meeting! Hope this helps!