This variable specifies the idle time, in seconds, that is allotted to the submitting user before the submit host terminates the current request.

The submittimeout variable is not honored in local mode.

submittimeout = number;
positive integer Enables idle checking; specifies the idle time in seconds.
0 or negative integer Disables idle checking. This value is the default.
Here the submitting user is allotted 300 seconds before the request is terminated.
submittimeout = 300;

For more information, please see runtimeout.