Video visibility time limit

So almost there where I what to be with XIBO.
We have XIBO hosted on the XIBO server.

I have a video the video plays for 45 sec.
So I was thinking ok let’s schedule this.
I schedule this with a priority 2 so my main layout with a radio stream will be muted. Now the video plays but . Not 45 sec. It plays with a minimum of 1 min ? Lower than that is not possible.

** Is it possible to play a video in the exact length as a layout? With priority?

Is there a other good option?