Use infinite maxInstance in Selenium Grid

i started Selenium Grid as Hub with default parameters:

java -jar selenium-server-standalone-3.4.0.jar -role hub

then i started a node with default parameters:

java -Dwebdriver.chrome.driver=C:\selenium\driver\chromedrive r.exe -jar selenium-server-standalone-3.4.0.jar -role node -hub http://localhost:4444/grid/register

when i checked localhost:4444 from web browser, i see following screen

As expected, there is allowing for 5 chrome instances.

after i execute my test scripts 5 times, i see following screen(warning):

So, my question is: When these slots will be free? or, is there any way to set infinite maxInstance value?