To view a list of attendees, and duration of attendance, log in to the Zoom web portal at https://zoom.us

The Zoom app will not work for this.

Click on the "Reports" link on the left.

Click on "Usage".

Find the meeting you wish to see the attendance roster, then click on the participants number at the far right.

You will see a list of attendees, and how long they were in the meeting. You can click on the "Export" button to download as a .csv file.