On Wednesday, April 5, 2017 at 6:58:50 AM UTC-5, wrote:
http://newatlas.com/siemens-airbus-e...-glider/48806/

76 seconds!

Now, just for the sake of comparison, take the petrol version of the Extra,with the same horsepower engine, with 15 minutes of fuel on board (since that is how long they say those batteries can power the electric version), and see how quickly it can get that same LS8 to 600 meters.