Hi,

Is there a way to influence the time delay of the appearance / disappearance of the subitems when you hover the mouse over a menu position?

Best wishes,
Björn

Yes you can setup the time.
Add this css code below to your css/custom.css and change the time in ms

.uk-open > .uk-dropdown {
-webkit-animation-duration: 5.8s!important;
animation-duration: 5.8s!important;
}