OK, I have beta 14 and this is the first time I have used it. I have 8 slides set in the slide view with a time per slide of 5 sec's, and a transition of 3 seconds. My math tells me that the duration should be be 74 seconds, slides and transitions. The timeline shows 19 sec's and when I try the preview button it fly's thro them as tho they do indeed equal 19 sec's in total. Also, when I right click in the preview pane looking for full screen preview it shows the slide I have selected full screen