Hello,

You can change this value in the following method (~\CMSScripts\skmmenu.js):

//Region Fade Functions
function skm_doTick(menuID){
	if (skm_clockValue>=skm_MenuFadeDelays[menuID]){
		skm_stopTick();
		skm_closeSubMenus(document.getElementById(menuID));
	} else {
		skm_clockValue++;
		skm_ticker=setTimeout("skm_doTick('"+menuID+"');", 500);
	}
}

As you can see, there is a value 500 milliseconds by default. So, you can change it according to your needs.

Please do not forget to clear browser cache and restart application [Site manager -> Administration -> System -> Restart application] after you change the value.

Best regards,
Michal Legen