This parameter is set when registering a node with a hub. The value provided to these parameters is the time in seconds that a hub can actually wait before it terminates a test script execution on a node if the test script doesn't perform any kind of activity on the node.
The command to configure your node with a node timeout is as follows:
java -jar selenium-server-standalone-3.12.0.jar -role node -hub http://192.168.0.1:1111/grid/register -nodeTimeout 300
Here, we have registered a node with a node timeout value of 300 seconds. So, the hub will terminate the test script if it doesn't perform any activity on the node for more than 300 seconds.
