Hey @user27!
We announced Wix Studio last week, a new platform designed for agencies and freelancers and built on the responsive infrastructure of Editor X.
In a few months time, Editor X sites will become a part of Wix Studio.
Wix Studio introduces new tools and features that many people requested to have on Editor X, including Slideshows (with timers 
).
In the meantime, I think this topic from a month ago should help 