Drop Down Menu Similar to xenForo?

Drop Down Menu Similar to xenForo?

How can I create a dropdown menu similar to xenforo, which will
automatically close after 2 seconds? I've tried searching but
unfortunately couldn't find any proper solution.
But I don't know how to and what code to put to achieve like; 1. The drop
down menu open after 2 seconds if the mouse cursor hovers over the main
menu link for 2 seconds. 2. The drop down closes if the mouse cursor is
away from the drop down for 2 seconds.
Thanks!
Here is Jsfiddle;