When setting the Estimated Duration, its important to be accurate. If enabled, the Estimated Duration will display on the Registration Page, Login Page, Email Messages and Calendar Reminders.
Estimated duration is setup in SETTINGS>Estimated Duration.
You can select from a range of 15 minutes to 180 minutes. In addition, you can select Custom and manually insert the estimated duration (in minutes).
When selecting/inserting the estimated duration, it CAN'T surpass the Max Run Time for the webcast. By default, the maximum amount of time a webcast can run is 4.5 hours (270 minutes).
The Max Run Time is indicated in OVERVIEW>DIAGNOSTIC INFORMATION>Max Run Time
For more information about Max Run Time, click here.