We returned from the UK last week via Doha and supposedly had 1 hour between connecting flights but only had 15 minutes in the PT due to our flight being late. This was a disappointment as I had been looking forward to spending a little more time there to experience the PT. In fact the PT was so full at midnight that we had difficulty in finding a seat so the short connections actually work in Qatar's favour by reducing numbers. Yes, you go through security again and the bus took only about 5 minutes from plane to PT as we were first stop.