From Xojo Documentation
| This item was removed in version 2020r1.
Please use AutoQuitTimeout as a replacement.
Property (As Integer )
The number of seconds after the last WebSession ends that a CGI application will quit. The default value is 60.
The web app is only quit if WebApplication.AutoQuit is True.
Change the timeout to 30 seconds:
App.Timeout = 30
WebSession.TimedOut event handler