Thanks Mike. I may have answered my own question. After extensive searching on line for an answer I saw a reference tom Amazon that Alexa will 'loop'. No better description as to what this meant exactly or how to initiate it. A classic problem when user manuals are written by those create the product and are way to close to the 'average guy's' perspective.
So, the command I used was, "Alexa play XXX and loop it". It was still running 12 hrs later. Give it a try.