Click on Options in the function bar below the main menu and select Global Options - Objects - Live video on the left. Here you can make settings for the behavior and properties of live video objects.
Under Duration you can enter the duration or the length of newly created live video objects.
Place a checkmark next to the control tracks new Live Video objects are to be provided with. See also Visual effects.
When there is a checkmark next to Show duration, the object length or duration is shown in the object info line.
See also