1) Navigate to the flashlight/js folder and rename avia_fullscreen_slider.js to avia_fullscreen_slider.js_bak.
2) Then rename avia_fullscreen_slider-not-minified.js to avia_fullscreen_slider.js
3) Now open up avia_fullscreen_slider.js and replace:
data.options = $.extend(defaults, options);
data.slides = slider.find(data.options.slides).css({display:'none'});
with:
data.options = $.extend(defaults, options);
if(jQuery('body').hasClass('home')) data.options.animationSpeed = 1500;
data.slides = slider.find(data.options.slides).css({display:'none'});
You can use any other value and you're not limited to 1500. The value needs to be in ms - so 1500 converts to 1,5 seconds.