Homepage slideshow - slow down image transition

Could someone please provide me with the right code to slow down the image transition in my homepage slideshow?

It is set up as "Slideshow:Full" and the animation is set to "fading", however there isn't really any fade - the images just flick from one to the other.

URL: https://pineapple-apple-52zp.squarespace.com/home-1

Using 7.1.

Thank you