Originally Posted by
lhrsfo
The last time I flew to DUS (from the UK, so non-Schengen), I was out of the airport within 5 minutes of the plane arriving at the gate and ten minutes of landing.
Same here.
The Skytrain runs every 3.5 to 7 minutes, and you can take it in either direction to connect to something, though if you have a tight schedule you should probably copy down the timetables of all possible trains/trams that you may need.