A Reader session is a 30-minute interval of time during which a QuickSight Reader can access dashboards and interact with data when subscribed to Capacity pricing. A Reader session starts with user-initiated action (for example, login, dashboard load, page refresh, drill-down, or filtering) and runs for the next 30 minutes. Keeping QuickSight open in a background browser window or tab does not result in active sessions until the Reader initiates action on the page.