n is an integer in the range 120—100,000. The default value is 300 (5 minutes).
ShutdownTimeout is the number of seconds InterSystems IRIS should wait for shutdown to complete normally before timing out and forcing a shutdown.
Changing This Parameter
On the Startup page of the Management Portal (System Administration > Configuration > Additional Settings > Startup), in the ShutdownTimeout row, select Edit. Enter a number of seconds.
Instead of using the Management Portal, you can change ShutdownTimeout in the Config.StartupOpens in a new window class (as described in the class reference) or by editing the CPF in a text editor (as described in the Editing the Active CPF section of the “Introduction to the Configuration Parameter File” chapter in this book).