syntax about slider shortcode

hi, i want to use the slider image shortcode but i want to Specifie the duration in milliseconds after which the next image is displayed.

I cant’ use the correct syntax…
something like [smfi-insert-default-slider slideshow-speed=2000] is it wright or wrong?

You can check about my question this link https://www.roman-bauer-web.de/wordpress-plugin-smfi/
thanks