Slideshow - Change duration settings

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Hi!

In the slideshow block, there is a field named "Duration". I want to be able to set duration in milliseconds instead of seconds.

An example: I want a slide to last 0.4 seconds. If I set the field to 0.4, 0,4, .4 it´s back to 0 when I open the block again.

Anyone know how to do that? Is it even possible?

Thanks!

shiki