Okay I found the answer. Apparently after importing a Poser animated object if you have it selected then go into the animation wizard to the (don't select any options on the way) Global Settings window there is a loop button. If you press that then go forward through the rest of the windows without pressing any other options to the point of finish this will result in the imported Poser animation repeating as long as you have a time line. So although the animation only lasts 5 seconds if I stretch the timeline to 15 seconds the Poser object will loop through and play its animation 3 times.