How to trigger an event after 10 seconds the user visits a page?

You can accomplish that using the tracking script and the following code:

<script>
  setTimeout(function() {
    AnyTrack("trigger", "LongVisit");
  }, 10e3);
</script>

This code will trigger a LongVisit event after 10 seconds the user has been in the page.

If you wish to change the amount of time the script will wait before triggering the event, simply change the value 10e3 to the amount of seconds you want to wait. For example 120e3 for 2 minutes (120 seconds).

Learn more about triggering custom events here.