If an AJAX request takes more than 3 seconds, do something

Question

I am developing an open source script for the cookie law that we have in Europe (actually, only in some countries in Europe).

I'm trying to add a functionality that detects wether the user that is currently browsing a website is from Europe or not, and to show the plugin only for those in Europe.

Freegeoip.net has a REST service that seems to suit well to my needs, but I have found that sometimes it is very slow (this could depend on the connection, but I'd prefere not to risk anyway) and there is a 10.000 queries per hour limit. Since my plugin is distributed through jsdelivr, a few big websites could possibly reach that limit.

So, here comes my question: how can I detect if that AJAX request is taking too long (let's say more than 3 seconds), and show the bar anyway?

It's a pure javascript plugin, here is the code:

var cookieLawStates = [
  'BE',
  'BG',
  ...
];

var checkEurope = new XMLHttpRequest();
checkEurope.open('GET', 'https://freegeoip.net/json/', true);
checkEurope.onreadystatechange = function() {
  if (checkEurope.readyState === 4 && checkEurope.status === 200) {
    var country = JSON.parse(checkEurope.responseText).country_code;

    if (cookieLawStates.indexOf(country) > -1) {
      // some other logic before showing the bar
    } else {
      console.log('Not an EU user. cookieBAR is shut down.');
    }
  }
}
checkEurope.send();

EDIT: thanks mplungjan for pointing me to another answer, even if it was a bit off topic here since I'm using plain javascript and not jquery... but it led me to this answer, which is exactly what I need.