Questions on playing Prezi in 4, 10 or 20 seconds

Questions on playing Prezi.

I'd like to know some things about the playback in Prezi. In the free version you can play Prezi in 4, 10 or 20 seconds, which means that each user can play the slideshow as they want, but if you have inserted or added a background music or voice throughout the presentation and each user plays as they want, this may be a problem of coordination.

Is it possible to set a fixed time playing in the paid version of Prezi?

Thank you very much and best regards.