How to add 5 minute javascript countdown timer which submit a form

Question

I want to add 5 minute countdown timer which submit a form to my php page.

Answer 1

setTimeout() will fire a function SubmitForm after 300000 milliseconds = 5 minutes.

function SubmitForm(){
    $("form").submit();
};
setTimeout(SubmitForm,300000);//5*60*1000