The basic functions of the Hover Box work well for my needs, but the actual transition animation between Regular and Hover states I find quite slow. Is there any method to manually set the time/speed for this?
Not really as it is a Wix app with it’s own settings. For more help with hoverboxes you are better suited going through Wix Support as this is not code related.
https://support.wix.com/en/the-wix-editor/hover-box
https://support.wix.com/en/about-wix/contacting-wix-support