@Vinicius5 - usually any system property that has a time value is an integer type. You can navigate to the sys_properties table and add a new record with the following: 

Name: glide.ui.active.session.life_span

Description: Sets the maximum session time for authenticated user sessions regardless of user activity. Authenticated users are logged out of the instance after the time specified and must enter their credentials again to access the instance.

Type: Integer

Value: 30